From the cited source:
Stalin is an uncommon figure in modern economic history: a dictator with absolute power who also controlled one of the largest economies in the world. Since it is virtually impossible to separate Stalin's wealth from the wealth of the Soviet Union, this combination has led multiple economists to nominate him as one of the richest people of all time.
...
While that money didn't belong directly to Stalin, he had the ability to leverage blah blah blah peepee poopoo
Neolib ghouls are absolutely wild.
He supposedly had $200,000 (in rubles) in a bag in his locker, the money he had earned from his book royalties, untouched. I've never heard of where that went afterwards though.