how did the communist experiment generate totalitarian regimes?

Trofim Denisovich Lysenko (Russian: Трофи́м Дени́сович Лысе́нко, Ukrainian: Трохи́м Дени́сович Лисе́нко; 29 September [O.S. 17 September] 1898 – 20 November 1976) was a Soviet biologist and agronomist. Lysenko rejected Mendelian genetics in favor of pseudoscientific[1][2][3] ideas termed Lysenkoism.

His experimental research in improved crop yields earned the support of Soviet leader Joseph Stalin, especially following the famine and loss of productivity resulting from forced collectivization in several regions of the Soviet Union in the early 1930s. In 1940, he became director of the Institute of Genetics within the USSR's Academy of Sciences, and Lysenko's anti-Mendelian doctrines were further secured in Soviet science and education by the exercise of political influence and power. Scientific dissent from Lysenko's theories of environmentally acquired inheritance was formally outlawed in 1948.

Though Lysenko remained at his post in the Institute of Genetics until 1965,[4] his influence on Soviet agricultural practice had declined by the 1950s.

TRUMP 2016

Totalitarian psychos like Lenin, Stalin, Mao, and Pol Pot, always took control. Many of them were former military officers. The ones that weren't gained control be sucking up to military officers.

cfr Karl Marx "The Communist Manifesto"

The "proletarian dictatorship" is a necessity for re-educating the population to a new society without classes and state.

After the re-education, the state should dissolve itself giving all the means of production (previously owned) to the people as collective ownership, starting the Communism.

... too bad Marx never understood the human nature... people in power usually try their best to keep it...

Corruption had to occur otherwise the financial interests of the most wealthy would be jeopardized so there was a lot of influence to corrupt it.

Through agglomerations of money,

the old tyranny works its way back in.