"Serious allegations have been made against the Congress president in the chopper deal. It has to come to light who has taken the money," he said at an election meeting here.
Accusing the previous Congress-led government at the centre of indulging in corruption, he said: "2G, 3G, helicopter. There were scams one after another during the Congress regime."
Singh said none could raise a finger of accusation against NDA government whether it was led by Atal Bihari Vajpayee or Narendra Modi regarding corruption.
Mocking the Congress-Left alliance, he said the two parties are fighting each other in Kerala but contesting the poll together in Bengal.
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Singh also criticised Trinamool Congress government for its "failure" to bring any change in the state despite giving its slogan for 'paribartan' given five years ago.
"Mamata Banerjee had given the slogan for paribartan five years back but after coming to power she has failed to bring any change," he said.
The youth in Bengal are not getting employment and industries are closed. "Only bomb-making industry flourished here," he remarked.
The union minister said he had talked to the people in the state and they had told him that if election is held in an impartial manner neither TMC nor Left Front would win.
He asked the people to cast their votes without any fear.