Naxalbari

During the mid 1960s Charu Mazumdar and Kanu Sanyal organized an ultra leftist faction in CPI (M) in northern Bengal. In 1967, a militant peasant uprising took place in Naxalbari, led by the Mazumdar-Sanyal group. This group would later become known as the Naxalites. The same year, Mazumdar and Sanyal broke away and formed the All India Co-ordination Committee of Communist Revolutionaries (AICCCR), which in turn founded the Communist Party of India (Marxist-Leninist) in 1969, with Mazumdar as its General Secretary.

From:-
The Heart of our Darkness
by Mohan Guruswamy