"Sonia Gandhi is a leader of political sins committed in the form of corruptions and scams," said Ramdev.
He also alleged that Sonia Gandhi had held democracy and democratic institutions hostage.
"Sonia Gandhi is a blot on politics in the country because she has held democracy and democratic institutions hostage and this curtailed the rights of 1.25 billion people," added Ramdev.
Baba Ramdev, who has been spearheading a national campaign against black money and corruption, had strongly supported Modi wave in India.
Ramdev has been touring India to garner votes for the Bharatiya Janata Party (BJP) after the party accepted his proposal to bring back black money stashed in foreign banks.