Prime Minister Narendra Modi, at a rally in Bengal on Sunday, claimed that the Trinamool government is putting obstacles in implementation of Centre's welfare schemes for poor people and urged the voters to teach the ruling party in the state by voting against them in the Lok Sabha polls. "It is time to teach Trinamool a lesson," said PM Modi in Jalpaiguri, adding that the Trinamool wants to have a free pass to loot and terrorise people in Bengal.