The three were transferred for their trial in the shoe baron Partha Pratim Roy Burman abduction case, Inspector General (Prisons) Joydeb Chakraborty said.
Rajeev Kumar, the Kolkata police commissioner, is known for his impeccable investigating and electronic surveillance skills.
Part of funding for 9/11 attacks in the United States had originated from India, according to a former top police officer Neeraj Kumar, who has based his claim on the "revelation" made by a terrorist.