Indian Communist Party (ICP) was a political party in India, a splinter group of Communist Party of India (CPI). The leader of ICP was Mohit Sen.
Sen parted ways with the CPI, following its anti-Congress stand, in 1978, following Indira Gandhi's emergency and subsequent failure in the election. In 1985, Sen joined the Indian Communist Party and when it merged with the All India Communist Party in 1988 to become United Communist Party of India, Sen became its general secretary, a post he held for 15 years till his death.
References
Indian Communist Party (Sen) Wikipedia(Text) CC BY-SA