While delivering the 15th D P Kohli Memorial Lecture for CBI on " Eclipse at Noon : Shadows Over India 's Conscience " with nearly 3000 officers of the agency in the audience , Gandhi noted that " The CBI is seen as the government 's hatchet , rather than honesty 's ally . It is often called DDT — meaning not the dichloro diphenyl trichloroethane , the colourless , tasteless , odourless insecticide it should be , but the department of dirty tricks . " In 2015 , he wrote a letter to the President of India , Pranab Mukherjee , to reconsider the rejection of the mercy plea of the 1993 Mumbai serial blast convict , Yakub Memon
1993 Mumbai serial blast
1993 Bombay bombings
Gopalkrishna Gandhi