In 1950 communist couple Rosenberg, US citizens secretly passed radar, missile, nuke secrets to USSR.
USSR developed nuke shortly.
US put them on trial n were sentenced to death by court.
Communist syndicate arranged global protests as like today for Indian maoists. https://twitter.com/ShekharGupta/status/1285210464821997569

There was protest by communist intellectuals in all major European cities.
Artist, painters, writers, poets, sculptors, playwriters either came on street or write letters for traitor Rosenberg couples release.
All belong to communist ideology.

Important among them was Pablo Picasso n French noble laurates.
Point to be remembered is, communist loyalty is to communist ummah first.
Communism doesn't accept national barriers.
Rosenberg couple spied to benefit a fellow communist country USSR.

So a communist in democratic country is always a national security threat.
They will carry out sabotage activities, instigate different people against state n when caught their international communist gang pretending as intellectuals comes out with signature campaign.

Rosenberg episode will answer Indians curiosity of why communists r so anti nationals.
Indian communists want communist China to prevail over India.
So they support jihadis n other secessionists in India with the intention to weaken India n help China.
Simple.