Ok this one is for
@jamahir but I will try to answer your question without disclosing names.
This is common knowledge amongst Indian Marxists of the earlier generation one whom I had the privy to meet when he was in his 90s almost 12 years back .
I subsequently confirmed the situation from one of our own expat leftists also aged 90+ .
They are all dead now, but I am 100% sure that our security apparatus has maintained these records, as has our enemy.
This goes back to 1946-47 in the turmoil of Partition and given Russia's inheritance of the Soviet legacy and interests in this region the information is still sensitive,
Let's get on the Time Machine.
First of all the Partition as we see it 73 years later was not only a black and white Hindu vs Muslim, Sikh vs Muslim affair. There were numerous side currents bitterly opposed to Partition, some very public and violent such as the "Naval Ratings Mutiny " 1946, ex-INA veterans, and of course the Communist Party of India (CPI) that was loathe to split along communal lines. However the CPI bosses were also a realistic and realized that India was too far gone down the path of religious frenzy to be stabilized in the short term .
Their efforts at deflecting the communal frenzy into a popular anti-capitalist anti-feudal revolution ( Airman's Mutiny etc.) had been a miserable failure and unless the Indian Armed Forces went "Red" there was no hope of taking power by revolution.
In any case first the British and then the Congress government banned the CPI which went underground. Likewise the Communist Party of Pakistan ( CPP) also went underground with its leader Jam Saqi and others fleeing to Afghanistan and subsequently the Soviet Union.
A frequent route taken by Indian revolutionaries. Subhas Bose had fled the same way.
Stalin watched in dismay as his well disciplined CPI splintered. While Pakistan wrestling with a myriad problems most important of which was Kashmir had little time chasing its leftists across the border India wasted no time rounding these up especially after the failed Telengana armed insurrection.
The CPI members fled via the Nepal China route but with a more difficult land route heavily patrolled most of the members of the CPI were arrested including some who were youthful rebel children of the Congress party cabinet members . The Muslim component of the CPI cadre was the most uncompromising, and many refused to surrender and some were shot.
For Muslim CPI members it was far easier to cross over into Pakistan and flee to the Soviet Union which they did , but were promptly arrested by the KGB, imprisoned and interrogated until they were convinced these were genuine leftists.
Meanwhile with India and Pakistan at loggerheads with one another over Kashmir, Stalins dream of a united leftist India ruled by a subservient CPI, granting the Soviet Union its warm water port was shattered.
So Stalin concentrated on Pakistan, because after all it was now Pakistan that was on the Border of Afghanistan and it was Pakistan that controlled the Baluchistan coast.
Stalin got together a conference of sorts, calling the CPI members and CPP members, both now under asylum in the Soviet Union asking them to agree to the following:
- The CPP would reach out to left wing army officers about seizing power and the Soviets would back a take over of Kashmir.
-The CPI would accept the loss of Kashmir and not support the government.(At this time India was considering removing the ban on the CPI ).
The CPI members ( including Muslims) disagreed and said they were against the communal partitioning of the country and that went for Kashmir too. Apparently they were less interested in the Soviet geo-strategic interests.
One of the junior Indian Muslim members ( "youthful rebel") who was present at that meeting only as an observer told me that any conversations they were trying to have with their Pakistani counterparts was strictly monitored by Urdu speaking Uzbek communist KGB cadres.
In any case the CPI members refused and were packed off to detention and subsequently sent back to India.
The CPP members returned to Pakistan to try to seek support amongst left wing PA officers. The Soviets also tried to officially approach Liaquat Ali Khan.
We now know that Pakistani intelligence smashed the CPP ring and this time chased them into Afghanistan, killing most of the top leadership. I am not sure if Jam Saqui survived because he had already been arrested. In any case the CPP was history apart from some poet celebrities like Faiz, Mustafa Zaidi etc.
In India, things were different. The CPI came above ground with leaders like S. A. Dange and Rajeshwar Rao who steered the party into an alliance with the Congress. This was deliberate. After the failure of the CPP the Soviets switched tack and began dealing with the CPI funding and guiding it to a position of extreme influence over the government of India. The alliance was so strong that any agreement between the Soviet Union and India was always referred to the CPI and the Indian government was aware of that.
The Soviet Union hoped to build India up to take over Pakistan and grant it the warm water port. Pakistan was not a military pushover and the Soviets were disappointed with India in the 1965 war. The Tashkent conference was salve. Which is why the eastern wing had to be separated first.