The poster had the pictures of Mahatma Gandhi, Subash Chandra Bose, Sardar Vallab Bhai Patel, Jaya Prakash Narayan, Chandrashekhar Azad, Bhagat Singh, Shankaracharya Jayendra Saraswati, Shivaji and Balkrishna.
A huge poster at the fast venue had Balkrishna's picture with the likes of Mahatma Gandhi, Subhash Chandra Bose and Bhagat Singh.
The poster was later removed after it was reported in the media.
The poster had the tag line 'jail is the holy place of revolutionary'.
Baba Ramdev's close aide Balkrishna, who is in jail in connection with a fake passport case, was equated with the freedom fighters at Ramdev's fast venue Ramlila Maidan on Thursday.