"We have received a letter from them (NGO)," Deputy Commissioner of Police (Central) DP Singh told PTI here.
Vineet Rui president of Bharat Bachao Sangsthan, which had recently staged a protest outside the West Bengal Human Rights Commission, of which Ganguly is the chairman, told reporters that they demanded legal action against the former Supreme Court Judge.
Police assured that they would look into the matter, the NGO said.