State correctional minister Abani Mohan Joarder said that they have been put under close surveillance and "the step has nothing to do with the CBI investigation."
"They used to take advantage inside the jail premises such as using mineral water, food from outside. We have ensured that these things are not repeated. They will have to remain like any other prisoner and will not be given any extra privilege," Joardar told PTI.
"We have been told to ensure that they don't mingle with the other prisoners. Whether they are passing any information or not should also be kept under tab. A sentry has been placed outside the cells of the chit fund owners. CCTVs cameras have also been installed outside their cells," a jail official said.
Jail doctors regularly monitor the health and diet of the chit fund owners.
The special surveillance arrangements comes in the backdrop of the concerns of various political parties, including BJP and Left Front over the safety and security of Sen and Kundu following their arrests in the Chit fund scam.