Lucknow, Sep 20 (ANI): Yoga Guru Baba Ramdev dubbed Prime Minister Manmohan Singh as a robot and slave of Congress President Sonia Gandhi. Ramdev obliquely said that Sonia Gandhi had taken control of democracy in India by subverting the Constitution. Yoga guru has decided to campaign in the country till parliament polls scheduled in May 2014. Born in a dusty village in northern India to illiterate parents, Swami Ramdev heads a $40 million global yoga empire and owns an island off the coast of Scotland.