Congress leader Rahul Gandhi on Monday promised a nationwide caste census and removal of the 50 per cent cap on reservation if the INDIA bloc forms the government at the Centre after the Lok Sabha polls. He also alleged that the BJP tried to topple the JMM-Congress-RJD government in Jharkhand as the chief minister was a tribal. "Want to congratulate all alliance MLAs, (Champai) Soren ji as that they stopped the BJP-RSS conspiracy and protected the government of the poor," Gandhi said at a rally at the Shaheed Maidan here. Gandhi claimed that Dalits, tribals, Other Backward Classes (OBCs) were made bonded labourers and their participation was lacking in big companies, hospitals, schools, colleges and courts. "This is the biggest question before India. Our first step would be to get a caste census in the country," the former Congress chief said. Noting that more than 50 per cent reservation cannot be given under existing provisions, Gandhi promised that an Indian National Developmen