I'd say a major turning point was the Bolshevik Revolution, which was instantly demonised in the US, and led to Wilson's "red scare" - which effectively destroy

I'd say a major turning point was the Bolshevik Revolution, which was instantly demonised in the US, and led to Wilson's "red scare" - which effectively destroyed organised labour. It rose again in the 30's only to be crushed again after WW2