1) Betrayed India's freedom struggle. 2) Hounded Kerala and Bengal 3)Security of China, and not of India, is uppermost in the minds of Communists.
They don't think China that had a large arsenal of nuclear bombs and a massive delivery system a potential threat to our security and territorial integrity.
CPM was extremely upset and sad when India became a nuclear power but is elated - as is evident from stray remarks by its leaders - that the rogue country has successfully tested the bomb with the help of nuclear technology smuggled from Pakistan.
The Communist parties persistently attack our security forces engaged in counter-insurgency operations in J&K and North East of "violation" of human rights but the very same parties remain mum on an extremely poor human rights record of North Korean.