One popular version was that it was Beria and several of Stalin's inner circle. They became alarmed when Stalin calculated that since Russia had lost 20M citizens and survived that a nuclear attack on NY was worth the risk! Check into the brilliant role of warfarin in Stalin's poisoning into small amounts acre actual healthy and hence the inner circle forced to share Stalin's meals could easily consume it with Stalin in limited sittings. Beria had purchased warfarin form the US in the 1930s. The alleged tale of the inner circle torturing Beria for his murderous perversions before killing him to silence him is “inspirational”!
Well, Lavrenti Beria did, according to the memoirs of Vyacheslav Molotov, say that he did Stalin in and saved them all.
What was being referred to cannot be ascertained as they guarded their speech at that time.
It could have meant that Beria delayed treatment to Stalin, or it could have meant that he actualy did poison the old jerk.
Stalin’s funeral was an interesting thing to read about.
Beria was stated to be triumphant and left for the Kremlin.
Someone stated that Beria was off to seize power, which began a mad dash for their cars from the funeral..