CRT is an Offshoot of CT (Critical Theory)

CRT is an offshoot of CT (Critical Theory) which, was developed by Communist intellectuals Horkheimer, Adorno, Habermas, and to some degree by Herbert Marcuse. They formed the Frankfurt School located in New York at Columbia University. Their form of Marxism is "Cultural Marxism." They attack the dominant culture.

Marxist worldview is a continuous class conflict between the Oppressors and the Oppressed—a very 19th-century view—a worldview from the age of Dickens, the early industrial age.

Marx initially believed the poor working class would rise against the middle and wealthier classes - the bourgeoisie - in their misery.
However, when Capitalism made the workers prosperous and no longer motivated to rebel. Workers don't rebel with full stomachs and a car in the garage.

Then these four developed CT, which would find the fissures and pressure points in society. All societies and groups have their unhappy and poverty-stricken disenfranchised, the young, looking to assert themselves, and the psychotic.
CT finds these groups, some with genuine complaints, then hammer and chip at these fissures to develop cracks to destroy the structure of a society.
In the United States, they have used race, traditional marriage, homosexuality, and
transsexuality vs. traditional homosexuality to divide and destroy National Unity.

They weaken the Country to gain wealth and power, eventually destroying the Country.
BLM co-founder Patrisse Cullors a self-described "Trained Communist," once-wealthy with unknown money (BLM funds?), bought four expensive homes in all-white communities. If she was genuinely Communist, why wasn't her wealth redistributed?
In her, we see the true goal of BLM activism, wealth, and power.

CRT is teaching Communist beliefs of Oppressed vs. Oppressors thru the classic method of self-criticism. I.e., a white child will be asked to draw a picture of a white man hanging a black man and ask the young child why he is doing that and then leads the child to the answer the teacher wants.
It is also referred to as Brainwashing.
Anyone who doesn't know that is unfamiliar with Marxism. Or lying!