He's talking about the frankfurt school, and its use of the Critical theory (aka the ouija board of social theories that you can analyze any minor difference with as long as you want the outcome to be there's an oppressor/oppressed situation here and it requires a bloody revolution) to foment radicalism and revolutionary violence in any group it can get its hooks into. The schools influences include the greatest hits of 18th and 19th century quackery, including marxism and Freudian psycho analysis, along with special guest, a blast from the past Idealism! Notable members of the Frankfurt school include Herbert Marcuse who is most known for being one of the three authors of Repressive Tolerance, a 123 page exercise in how to say we need to kill a whole bunch of people until the repression free utopia emerges from the pools of blood, without actually saying we need to kill people outright.