She says that in the final years of the Soviet Union the Communist government gunned people down in the streets. I would be curious to learn more except I can’t find anything about it, besides this event.

Because there wasn't anything else except this. And this wasn't "gunning people in the streets" it was accidental fuckup going explicitly against orders during a regular battle in where workers armed with steel pikes and pickaxes assaulted militia and were beating and threatening with death captured militiamen. Also militia got explicitly refused the permission to use firearms by minister of interior Kiszczak and general Jaruzelski, so the government is not responsible (this was also established in several trials even despite court was clearly biased). Here is some relevant reading, in Polish.

Poles, especially abroad, often lie about that, knowingly or not, because Poles abroad are often gusanos having material interests and past history of their burgie families to oppose any kind of socialism, and Polish public spaces since 1989 are in the information propaganda bubble comparing to which even the one in USA looks like sieve.

Btw note the irony clearly visible even in the bubble: 9 deaths is the founder myth and the "greatest crime of communism", while just the transformation into capitalism saw social murder of few hundred thousands at least.

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