Marxism and Communism were invented by people of the Jewish tribe. I use the word 'tribe' instead of Jewish 'faith' since atheism would contradict the tenants of Judaic faith so a Jewish atheist may be an oxymoron. Karl Marx, the co-author of Das Capital and Communist Manifesto was of Jewish ancestry with both his maternal and paternal grandfathers being rabbis. Leon Trotsky, whose original name was Lev Davidovich Bronstein, was born from Jewish parents.
Karl Marx formed the ideology of communism and Trotsky its implementation in the October Bolshevik revolution of Russia in 1917. Trotsky was founder and commander of the red army and his efforts were critical for both the victories of the revolution and the Russian civil war (1918-1923).
The communist revolution liberated Soviet Jews from the ghettos and allowed them to flourish in administrative, academic, and scientific posts in the Soviet state. While Stalin himself was not of Jewish ancestry, much of his cabinet, advisers, and top administrators were of Jewish extraction. Since communism's ideology, implementation, and administration were much carried out by people of Jewish extraction, it was only natural for Stalin to assume the Jewish state would be a communist or socialist one.
If Hitler's war against the Jew was to succeed, then he had to invade the Soviet Union where Jewish dominance in state administration prevailed. Most of the Jewish refugees immigrating into Palestine were from the communist countries of eastern Europe and the Soviet Union, a direct result of the Nazi invasion.
While the Arab population of Palestine was tolerant up to a certain point for small numbers of refugees, the sudden huge influx crossed this reasonable and tolerable threshold. The Arab nations were either British or French colonies. By supporting Israel to cause a successful implementation of socialist state, Stalin hoped to inspire socialist or communist revolutions in the Arab states to overthrow their colonial puppet governments.
Jewish intellectuals in the west were also socialists such as Albert Einstein and Robert Oppenheimer. Einstein was quoted as saying capitalism is economic anarchy. The Rosenberg spy couple who compromised US advantage in nuclear weapons technology to the Soviets and then executed were Jewish. Since many top intellectuals in the west were Jewish and socialist, Stalin, by supporting Israel hoped to at least strengthen the premise of ideological superiority of Marxism over capitalism in western debates, and cause intellectual dissension in western capitalist establishments.
The Bolshevik revolution like the formation of Israel was financed by Wall Street and western Jewish bankers and financiers. Before the Bolshevik revolution most of Russian capital was not Jewish (Gentile) in the ownership of the czar or the church. After the revolution, much of the czar's and the church's gold and other wealth was looted by the Bolsheviks. The western Jewish capital wanted to annihilate the Gentile Russian capital and aristocracy. This was payback after centuries of czarist persecution and pogroms against the Russian Jewish population.
By supporting and recognizing Israel, Stalin wanted to continue this war between the Jewish and Gentile capital as a divide and conquer strategy.