Stalin was not jewish. He was ethnically Georgian.

But Stalin was married to a Jewish woman.

He was mentored by a Jewish man.

After Lenin died, Stalin was chosen to be a gentile face to lead the Jewish Supremacists communist movement.

The Jewish Supremacists leading the communist movement were always looking for more gentiles to put into leadership roles in order to obfuscate and hide the overwhelming Jewish nature of the communist movement.

And yes, it is true that after decades of leading the Soviet Union, in the 1950s, Stalin actually turned against some of the Jewish Supremacists and conducted a purge to remove some of the most obvious Supremacists from leadership positions in the Soviet government.

Stalin was able to skillfully use conflict between competing factions of Jewish Supremacists to his advantage in order to take enough power to be able to conduct a purge of some Jewish Supremacists in the early 50s.

That's why they poisoned/murdered him in 1953 before he could conduct a second major purge of Jewish Supremacists.