The CBI Wednesday registered a case against Dera Sacha Sauda chief Gurmeet Ram Rahim Singh in connection with the alleged forced castration of 400 devotees inside his ashram in Sirsa, Haryana.The agency booked the Dera chief on charges of criminal conspiracy, cheating, voluntarily causing grievous hurt by dangerous weapons and criminal intimidation under the Indian Penal Code, following an order by the Punjab and Haryana High Court.A former Dera follower, Hansraj Chauhan, had filed a petition in the high court in 2012 alleging that he along with around 400 male devotees of the Dera were castrated inside the ashram on the orders of Gurmeet Ram Rahim Singh.Disposing off the petition moved by Chauhan, the high court had ordered a probe by the Central Bureau of Investigation into the case in December 2014.