Critical Theory exists, and it is not a 'conspiracy theory', but rather a political and cultural strategy that is aimed at degenerating the culture, by design...which will in turn prepare people to accept communism/socialism. All of these identity based courses taught in the colleges, Women's Studies, Critical Race Theory, LGBT Studies....it is all the product of the Frankfurt School and their Critical Theory.
I do think you conflate a number of social movements though..with socialism...when they are just expressions of the changing demographic..most of those Progressive folk..are ineffectual.
Well these were some of their stated goals, and all the stuff Marcuse and the rest taught is what informed the New Left during the 60's on down to today.
1. The creation of racism offences.
2. Continual change to create confusion
3. The teaching of sex and homosexuality to children
4. The undermining of schools’ and teachers’ authority
5. Huge immigration to destroy identity.
6. The promotion of excessive drinking
7. Emptying of churches
8. An unreliable legal system with bias against victims of crime
9. Dependency on the state or state benefits
10. Control and dumbing down of media
11. Encouraging the breakdown of the family
Every last one of those things has happened or is in the works currently, tweeked to fit the times of course.