India's Election Commission has removed more than 130 million names from voter rolls in a nationwide "special intensive revision" — a number exceeding the entire population of Japan. The opposition alleges the purge disproportionately strips voters likely to oppose Prime Minister Narendra Modi's BJP, while preserving or adding those likely to support it. The Election Commission says it is removing duplicates and ineligible entries. Both claims remain unverified at scale. The resistance is being led in part by the Cockroach Janta Party (CJP), a movement that began as satirical Gen Z online activism in May and has since organised street protests across the country. The CJP already has a scalp: earlier this year, its pressure campaign forced the resignation of Modi's education minister over exam paper leaks. It is now mobilising for a mass march to Delhi's Jantar Mantar protest site on Saturday. Ahead of the march, the CJP claims at least 10,000 people — drawn from its own ranks, student organisations, grassroots groups, and political parties — have been detained across India. Videos on X show activists being loaded into vans. A group of students from Pune heading to Delhi was reportedly intercepted and bused to an unknown location. Police have not responded to Reuters' requests for comment. The Congress opposition party has escalated alongside the CJP. On Wednesday, party leader Rahul Gandhi, his sister Priyanka Vadra, and other lawmakers were briefly detained while trying to reach the protest site. Congress accused police of "brute force"; Delhi Police said the allegations were intended to "defame" them. BJP spokesperson Gaurav Bhatia called the opposition "irresponsible" and "anarchist," dismissing the claims as baseless. The structural question is whether a voter-roll purge of this magnitude — affecting more people than live in most countries — can be legitimate housekeeping or is inherently a tool of electoral engineering. India's Election Commission has legal authority to revise rolls, but the scale of deletions, the timing relative to future elections, and the pattern of who gets deleted versus who gets added are the variables that determine whether this is democratic hygiene or democratic sabotage. Modi is midway through his third term, and the CJP represents something his political machine has not previously faced: a decentralised, meme-native youth movement that treats institutional politics with contempt but has learned to generate real-world pressure. The movement's name — "Cockroach" — is the tell. It signals an identity built on being impossible to stamp out. Pre-emptive mass detention may validate the metaphor rather than suppress it. Delhi's protest corridors are now barricaded. The question for Saturday is not whether people show up but whether the state's response — detention, barricades, force — converts a manageable political challenge into a legitimacy crisis for the world's largest democracy.