Konattu Madam Chidambara Iyer Subrahmania Iyer, known better as K.
C.
S.
Mani (2 March 1922 - 20 September 1987), was a socialist activist of Kerala who is known for his attempt of assassination on C.
P.
Ramaswamy Iyer, the then Diwan of Travancore, a princely state in India.
This incident was a turning point in the history of Kerala, forcing the Diwan to leave the Kingdom of Travancore and flee to Madras after assenting to merge Travancore with the Union of India.