The Frankfurt School and the "New Left"

[StockholmSyndrome]

I recently watched a tasty nugget of white nationalist/fascist propaganda on Youtube about the Frankfurt School and the New Left. The narrative of the video goes something like this:

After the failure of the May 1968 uprisings in Paris, the old revolutionary leftists went underground to devise a new strategy. The Frankfurt School become the ideological engine of this "New Left" movement which decided that advocating for a broader spectrum of causes such as women's rights, multiculturalism, gay rights, drug legalization, etc. would allow them to gain influence "democratically" and gradually "destroy Western society" from the inside. I can't post the youtube video because I'm a rookie here, but its called "Who is Killing Western Society?"

I have a few questions. Simply reading wikipedia is not satisfactory as I'd like the perspective of the people in this community.

My questions are these: What is the real relationship that the Frankfurt School had with the New Left? What is your take on the Frankfurt School? What exactly is/was the New Left, and what is/was its relationship with Marxism? Wouldn't it be cool if there actually was a conspiracy such as this?

[Dimentio]

I think they're talking about Gramsci rather than the Frankfurt school, and what they are attacking is the "attack on the bourgeois hegemony".