Even when bringing up the Communism influence, it's still interesting to note that old school Socialists were race realists who believed in maintaining the nuclear family and restricting immigration.

The last living relic of this system is arguably North Korea. Citizenship is almost entirely passed by blood. It's completely rare or unheard of to see non-Koreans be given permission to immigrate and join the natives living there. On top of that, North Korea still enjoys higher birth rates

(relative to Capitalist societies) and Homosexuality is never promoted.

What we see in the West today is a much more perverted version of Leftism/Socialism. In which case, Western Leftists want to open up the borders, promote race mixing, promote LGBT-ism, tear apart the nuclear family etc.