Socialism

You realise the USA has its own slave labour gulag unmatched by Russia and China today, right? Though Soviet gulag was ruthless, born to meet rapid wartime industrialisation and unrelenting landowners (kulaks), it was more lax and informal than Auschwitz death camps that you wish to portray.

Meanwhile, Jim Crow and sundown towns in the USA oversaw its own apartheid underclass, many of whom looked to Soviet Russia for equity, Paul Robeson being the most notable.

Edit: replaced Tsarist-era 'The Black Russian' episode with more intended Soviet-era link, quite belatedly.