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I find the idea of closed shops insane, like all employee have to be union members and there can only be one union

Then you'll be glad to hear these were forbidden in the US in 1947.

And so where are coming from the "closed shop" the parent was talking about?

No idea, I can only imagine they redefined the word. Closed shops were made illegal by the Taft-Hartley Act. https://en.wikipedia.org/wiki/Taft%E2%80%93Hartley_Act