This narrator's overview of Cultural Marxism is a bit more textbookish than Beck's, but is still a good overview of the transition from the global communist revolution attempted from 1917 to the 1930's, and after its failure, the founding of the Frankfurt School, and its evolution from the 1930's-1960's of what came to be termed Cultural Marxism.

https://www.youtube.com/watch?v=acjIw7cVc2k

It also shows photos of most of the influential members of the Frankfurt school, such as Lukacs, Adorno and Marcuse.

These were the heavy hitters of the movement, of whom Saul Alinsky, William Ayers, Wade Rathke, and the like built on in the 1960's (David Horowitz, interviewed here, was one of them until he turned on Leftism and became one of the most prominent conservative critics of the radical Left).

And that Van Jones, Valerie Jarrett, Barack Obama and Hillary Clinton are the next generation of.