Wrong: https://en.wikipedia.org/wiki/Tankie

But actually: JFK Files Reveal CIA Role in the 1956 Hungarian Uprising

The Hungarian Freedom Fighters were [Central Intelligence] Agency sponsored.

See also:

• Operation Gladio
• Operation Condor
• The U.S. Did Not Defeat Fascism in WWII, It Discreetly Internationalized It
• The blueprint of regime change operations How regime change happens in the 21st century with your consent
• Foucault, Anti-Communism & the Global Theory Industry: A Reply to Critics

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And, incidentally, the tanks were leaving Tiananmen Square, not entering, “Tank Man” left the scene unharmed with some other civilians: https://www.youtube.com/watch?v=qq8zFLIftGk

See Tank Man at the bottom-left.