Ganesan joined DMK in law school. He was also imprisoned under the
MISA act. He was the chief of the
Anti-Hindi Agitation in 1965. In December 2006, Marumalarchi Dravida Munnetra Kazhagam (MDMK) general secretary Vaiko "temporarily" relieved the party's presidium chairman L. Ganesan and deputy general secretary Gingee N. Ramachandran of all posts and responsibilities for indulging in "anti-party activities". In July 2008, he was expelled from the MDMK after voting against the UPA government. After his service for Chief Minister Karunanidhi, he broke ranks with Kalaignar and other DMK leaders, and along with Vaiko, Gingee Ramachandran, N. Kannappan and
Nanjil Sampath, formed MDMK. ==Death==