On June 9, compounding her significant woes, police arrived at Mamata Banerjee’s house in connection with a case filed against her over the forgery of signatures of legislators who had supported her. It solidified her abject isolation in this odd moment.§The collapse of the Trinamool Congress was as spectacular as its formation, driven by a striking organisational irony. The TMC began in 1998 as a breakaway force led by a rebellious Mamata Banerjee against the parent Congress. Decades later, its disintegration was accelerated from within when a turncoat with negligible independent popular support turned against the leadership that had trusted and elevated him. The rapid institutional dissolution of a party that dominated West Bengal politics for 15 years represents something far deeper than a conventional electoral reversal, defying the standard cyclical volatility of democratic politics. What has happened to TMC is more elementary than the fortunes lost by the Congress after the Emergency and the Left in Bengal. It is the fall of a ruling ecosystem that had forgotten how to exist outside power.The most brutal part of this collapse came not in Kolkata but in New Delhi. After the Assembly election defeat, TMC’s residual national relevance depended almost entirely on its parliamentary strength. Even after losing Bengal, Mamata Banerjee could still claim a national role as the leader of one of the largest non-Congress opposition parties in parliament. This last platform collapsed when the legislative rebellion replicated itself at the national level on June 8, 2026, unfolding directly in New Delhi, barely a kilometre away from the Constitutional Club where Mamata Banerjee was attending an opposition INDIA bloc meeting.Coordinated by Suvendu Adhikari and Biplab Deb, a faction of approximately 14 Lok Sabha MPs convened an operational meeting at the residence of Union Minister Bhupender Yadav before transitioning to a highly visible public gathering at the Delhi home of TMC’s Satabdi Roy. Led by veteran MP Kakoli Ghosh Dastidar, this group formally petitioned Lok Sabha Speaker Om Birla for institutional recognition as a distinct legislative bloc aligned with the BJP-led National Democratic Alliance.Given that the TMC held seats in the Lok Sabha, this 20-member faction successfully crossed the critical two-thirds mark necessary to achieve protection under the anti-defection law, a manoeuvre heavily facilitated by Adhikari’s pre-existing relationships with wealthy and influential representatives from key border districts like Murshidabad.The reported breakaway faction includes a substantial list of prominent parliamentarians, including Kakoli Ghosh Dastidar, Satabdi Roy, Deepak Adhikari, Yusuf Pathan, Rachana Banerjee, Prasun Banerjee, Abu Taher, Khalilur Rahman, June Maliah, Bapi Halder, Partha Bhowmick, Arup Chakraborty, Kalipada Saren, Sharmila Sarkar, Asit Mal, Jagadish Basunia, Sajda Ahmed, Mitali Bagh, and Pratima Mondal.The rebel MPs framed their institutional departure through a moral and political vocabulary, with Kakoli Ghosh Dastidar publicly criticising the centralised influence of Abhishek Banerjee’s unelected advisers, systemic corruption within the state’s ration distribution and teacher recruitment systems, and a restrictive internal party culture.TMC’s national structure also suffered an additional institutional blow with the formal resignation of veteran Rajya Sabha MP Sukhendu Sekhar Roy from both Parliament and the party. Roy explicitly cited the leadership’s total lack of post-defeat introspection, broader governance failures, and the administrative handling of the R.G. Kar Medical College crisis as the foundational reasons for his departure. Bengali actor Koyel Mallick, the newly elected TMC Rajya Sabha MP who has yet to attend a session, is also expected to resign anytime now.Before the parliament, the assemblyThe parliamentary rupture was preceded by the assembly split, where the party first lost control over its legislative body in Bengal. The internal mutiny assumed a formal legislative dimension during the selection process for the Leader of the Opposition. While the official party leadership nominated veteran legislator Sovandeb Chattopadhyay, a dissident faction led by two newly elected MLAs, Ritabrata Banerjee and Sandipan Saha, challenged the choice, alleging that signatures on the official nomination papers had been systematically forged.Chief Minister Suvendu Adhikari rapidly capitalised on this internal dispute by ordering a formal investigation by the Criminal Investigation Department into the alleged forgery. The threat of criminal prosecution created a compliance panic among wavering legislators, ultimately driving 58 to 60 MLAs to consolidate behind the rebel faction, comfortably surpassing the threshold required to bypass the anti-defection law.In response to the loss of the legislative wing, Mamata Banerjee initiated a series of sweeping administrative countermeasures, dissolving all regional and state organizational committees across West Bengal. The resulting executive restructuring functioned as an emergency balancing act. The structural realignment did not have a Muslim face. It also led to the exclusion of Firhad Hakim from the central leadership hierarchy, precipitating his resignation as mayor of Kolkata. Since then, Hakim has shown indications of joining the rebel camp.A vulnerability or twoWith old loyalists now abandoning ship, the story of the TMC is beginning to look all but over. In her 42-year political career, Mamata Banerjee has never appeared this vulnerable. And what makes it even more startling is it did not take even 42 days after the shock defeat of the 2026 Assembly election for the empire to start coming apart.The BJP secured a decisive 207-seat majority, reducing the TMC to a marginal 80 seats and abruptly terminating its institutional monopoly. Mamata Banerjee’s individual defeat in Bhabanipur transformed an operational setback into a deep psychological rupture. It signalled to the sprawling network of municipal councillors, rent-seeking contractors, regional satraps and celebrity politicians that the state’s protective administrative canopy had dissolved.The Falta assembly seat further exposed the operational fragility of TMC’s grassroots dominance with brutal clarity. Once regarded as an impregnable TMC stronghold, the constituency became a microcosm of the party’s wider organisational collapse. Its official candidate, Jahangir Khan, abruptly withdrew from active campaigning just before polling. The BJP captured more than 71% of the vote and the TMC finished in a humiliating fourth.This localised collapse provided empirical proof of a hard reality. Without the reinforcement of the state administrative machinery to suppress dissent, the party’s grassroots control could evaporate overnight, triggering an immediate survival calculus across ranks.A party in powerDeprived of its governing core, the liquefaction was a foregone conclusion. For years, TMC’s greatest strength was also its deepest structural defect. It was less a party than a political economy. The ruling party delivered protection, access, contracts, postings, police indulgence and social status. In return, local satraps delivered votes, funds, intimidation and organisational muscle.This arrangement worked as long as the bureaucracy, the police station and the panchayat office moved in the same direction. Once state power shifted, the transactional arrangement between the party and its satraps collapsed overnight. Leaders who had forgotten how to exist without state power immediately looked for new shelter. External legal pressures exerted by the BJP heavily accelerated this realignment. Active central agency investigations, close scrutiny of personal assets, and the threat of bulldozer actions gave regional leaders and legislators a powerful incentive to abandon the party core.This dynamic explains why so many compromised figures remained indispensable to the TMC for so long. The leadership routinely distributed tickets to individuals facing serious allegations of corruption, extortion, arrogance and syndicate politics. These figures were valued because they were either electorally useful or financially vital. Some controlled entire districts, while others managed localised networks of revenue and coercion. The party knew the long-term structural risks but accepted them as the basic cost of maintaining power.The same pattern defined the 2024 Lok Sabha and 2026 assembly nominations. The TMC sent a high-profile mix of celebrities, wealthy industrialists, and regional power-brokers to the parliament. Most of these candidates carried significant commercial or legal baggage. Several faced active investigations into legacy scandals like Narada, Saradha, and Rose Valley.A pattern of discomfortSatabdi Roy, who has emerged as a primary architect of the parliamentary rebellion, had signaled deep discontent as early as 2020-21. She was on the verge of defecting to the BJP at the time, but the TMC leadership intervened to placate and retain her. The logic behind her retention was entirely unsentimental. Birbhum was simply too vital a political and revenue-generating node to risk disrupting, especially with regional strongman Anubrata Mondal already facing severe central agency pressure.Actor and MP Deepak Adhikari, popularly known as Dev, was subjected to extensive questioning by the CBI and the Enforcement Directorate regarding alleged financial links between his independent film production ventures and Enamul Haque, the principal accused in a cross-border cattle-smuggling syndicate.Kakoli Ghosh Dastidar, Sougata Ray, and Prasun Banerjee have all been featured in the Narada sting operation, where leaders were filmed accepting cash for political favors. Similarly, Sudip Bandyopadhyay and Satabdi Roy faced years of scrutiny over their alleged links to the Saradha and Rose Valley ponzi schemes.Former international cricketer Yusuf Pathan faced a major municipal land dispute in Vadodara, where the Gujarat high court explicitly characterised his occupation of municipal land as an encroachment. In Murshidabad, Khalilur Rahaman operated as a dominant figure within the regional beedi manufacturing industry, a position that drew consistent criticism from labour organisations regarding low wages and systemic worker exploitation. Partha Bhowmick maintained extensive commercial interests across petroleum retail, hospitality partnerships, and real estate.While the TMC’s success in the 2024 Lok Sabha election initially suggested institutional strength, it concealed profound structural vulnerabilities, as many of its newly elected representatives possessed exceptionally high asset declarations, complex business interests, or active investigations under the Prevention of Corruption Act. This was not an aberration. TMC expanded by absorbing defectors, rewarding muscle, tolerating local fiefdoms and using the administration as a political amplifier. Police stations became, in the public imagination, extensions of party offices. Local leaders who should have remained accountable to citizens often behaved like franchise-holders of coercive authority. In the assembly, the Speaker allowed opposition MLAs to join the ruling party without facing defection laws.It is no surprise, therefore, to see names such as Kakoli Ghosh Dastidar, Deepak Adhikari, Partha Bhowmick or Yusuf Pathan in the list of rebel MPs willing to join the NDA. It is a reminder that a party which rewards legal vulnerability for short-term gain fractures the moment power vanishes.A style of ruleThis internal decay, however, was manufactured inside TMC, especially through the rise of Abhishek Banerjee. His ascent transformed the party’s culture. The TMC that had once prided itself on street politics increasingly appeared to be run like a closed corporate office, with Abhishek as CEO and I-PAC-style consultants as process managers. Senior leaders who had fought the Left suddenly found themselves answerable to dashboards, survey teams and unelected strategists.Abhishek’s style worsened the resentment. The language of succession – terms like the “Prince of Bengal” are often used for him – should embarrass any serious politician in a democracy. Instead, TMC allowed a court culture to form around him. His security arrangements and political insulation were seen as expressions of entitlement. After defeat, party old guards who had remained silent during the winning years began blaming his high-handedness, I-PAC’s influence and the collapse of grassroots connection.Internal friction reached a critical flashpoint during the party’s first post-election meeting on May 6, when Mamata Banerjee reportedly instructed newly elected MLAs to stand and applaud Abhishek Banerjee for his campaign management despite the crushing defeat. For senior leaders who had survived the Left, built the TMC district by district, and then watched the party collapse under a dynastic-corporate structure, this was humiliation disguised as a call for loyalty.The public ridicule that followed increased it. Across Bengal, formerly untouchable TMC figures encountered public anger with “chor, chor” slogans, rotten egg attacks, hostile crowds, arrests, and street humiliation. Abhishek Banerjee was attacked in Sonarpur with eggs and stones. Sougata Roy and others faced similar public outbursts. Some of this anger was surely spontaneous. Many may have been encouraged or amplified by the BJP’s victorious machinery. But the symbolism was devastating. The men and women who once embodied fear became caricatures of power without power.Ultimately, the events of 2026 expose the fatal flaw of a regional party built entirely on corporate funding, electoral management, and state patronage rather than ideological cohesion. Observers have compared the BJP’s management of this split to the previous realignment of the Shiv Sena in Maharashtra, noting that the central party effectively deployed state power, legal investigations, strategic hospitality, and rapid institutional recognition to consolidate the breakaway factions.The transition of these extensive patronage networks into the NDA helps BJP in reducing dependence on Chandrababu Naidu’s TDP or Nitish Kumar’s JDU in the parliament while making West Bengal assembly, nearly “birodhi–mukto” – sans opposition. The next major election in the state in the municipal corporation elections, where the party now has an extraordinary advantage. Mamata Banerjee built TMC by shattering the complacency of the Left. Ironically, her own party has collapsed under the weight of a similar complacency – the belief that power, once captured, becomes permanent.