Socialism spread across college campuses decades ago after professors went to the Soviet Union and were exposed to the Soviet system. When they returned, they began teaching socialism to future teachers in the US, and that process of teachers teaching teachers has subverted the entire education system.
If you don’t know what the Frankfurt School is, you better find out. It was founded in Germany but moved to Columbia University in the US in 1934. Its purpose was to undermine any aspect of Western culture that encourages personal independence so that, eventually, all citizens must be dependent on and obedient to the state. Communism was the goal but not by that name. Generally, this strategy is known as Cultural Marxism.