West Bengal BJP chief Dilip Ghosh on Monday sent a legal notice to Trinamool Congress (TMC) MP Abhishek Banerjee for allegedly using derogatory words against him at a rally and said the behaviour displayed lack of courtesy towards an opposition party leader. Dilip Ghosh's lawyer sent a legal notice to Banerjee for the words he allegedly used at a rally in Bengal's South 24 Parganas district on Sunday. Abhishek Banerjee is the nephew of Chief Minister Mamata Banerjee.