It is true that criminals are used by intelligence and crime agencies all over the world to collect information. However, checking them not to exceed their brief is the most difficult responsibility, writes Vappala Balachandran.

Dey, a veteran crime journalist, was shot dead in suburban Powai on June 11, 2011, while he was on his way home.

So was there a deal? Did he surrender? Or was it a highly-successful operation to nab a "dreaded gangster"?

National ?Security ?Advis?o?r Ajit Doval is rounding up D-Company men one by one, but will he get to the real prize while the off-shore crime empires start to crumble?