This is far more nuanced and sophisticated than the McCarthy era. What we have going on here is the class of 68 - now our professors and politicians, inspired by China's rise - attempting to resurrect the ideal of the "alternative society" of the USSR they were bought up on. Some of them fled to Cuba after bombing ordinary people.
What do they idealize for the US? A "corrected" superpower version of the "alternative" (counter-culture) society they were promised. Like America, but with free everything, for everyone. The thing which would have transpired if Stalin hadn't annoyingly "corrupted" the pure vision of his friend Trotsky.
All of this started in 2014 with the Ferguson riots. They are using black people (and their grievance with the cops) as their "useful idiots", or a revolutionary vanguard. And those aggrieved BLM foot soldiers are using their racist plantation governors to affect a South Africa-style Marxist revolution. We don't have a singular conspiracy here, but an inter-party war between competing sides.
This is a racist war, but we're not in it. Neither should we be. The question is, what do we do now?
Diversity is the slow poison to destroy societies. Throughout history "Diversity is (((our))) strength" refugees trickle in until the cultural divide breaks social bonds. If not race, then with Gender or Religion. Weak countries can't fight head on so they get countries to fight themselves. If it's too homogeneous, import the diversity.