He became the president of the Travancore Students Federation while he was an intermediate student at
College of Fine Arts Trivandrum. During this period, he was jailed for urging students to join the freedom struggle, during a public meeting held at
Thirunakkara. The famous '
Kozhencherry speech' by
C. Kesavan inspired Mammen to dedicate himself to social causes. The National Quilon Bank was closed by
C. P. Ramaswami Iyer who was the then
Diwan of
Travancore. Mammen's father, K.C Eapen - the brother of
K.C Mammen Mappillai, was among the officials arrested and ended up dying in jail. He died on 26 July 2017. ==References==