The founder of the John Birch Society, Robert H.W. Welch Jr., was an old time classical Unitarian (and an evolutionist as well).
One of the most conservative and pro-Confederate people I know personally is a Oneness Pentecostal.
I'm just saying the overall trend among the elites was once trinitarianism became less popular among their culture of elites and they embraced unitarianism, it was only a short time later they embraced Karl Marx' liberation theology. Not all of them, but that seemed to be the trend.
As an example, look at how Harvard changed in the early 1800's as unitarianism became more popular in Harvard, especially after Henry Ware became university president.
Or look at Tuskegee Institute (a black college) here in Alabama. There was a time when Tuskegee was graduating more future self-made millionaires than was coming out of Harvard, Princeton, and Yale combined. But that changed after the Tuskegee leaders (the aforementioned wealthily alumni later running Tuskegee) decided they wanted to be like rich whites and quit believing the divinity of Jesus. From there it was just a short step into marxsim and liberation theology.