http://www.americanthinker.com/articles/2015/08/the_quiet_revolution_how_the_new_left_took_over_the_democratic_party_.html
Gramsci argued that communists’ route to taking power in developed, industrialized societies such as Europe and the United States would be best achieved through a “long march through the institutions.” This would be a gradual process of radicalization of the cultural institutions -- “the superstructure” -- of bourgeois society, a process that would in turn transform the values and morals of society. Gramsci believed that as society’s morals were softened, its political and economic foundation would be more easily smashed and restructured. Cultural Marxism was also in vogue at the Institute of Social Research at Frankfurt University in Germany -- that is until 1933 when the Nazis came to power. Many members of the “Frankfurt School,” such as Herbert Marcuse, Eric Fromm, Theodor Adorno, Max Horkeimer, and Wilhelm Reich fled to the United States, where they ultimately found their way into professorships at various elite universities such as Berkeley, Columbia, and Princeton. In the context of American culture, “the long march through the institutions” meant, in the words of Herbert Marcuse, “working against the established institutions while working in them.” While the Frankfurt School was neo-Marxist, many of its adherents were less interested in economics and redistribution of wealth than in remaking and transforming society through attitudinal and cultural change. They incorporated Marxist class theory into sociology and psychology while also assimilating Freud’s theories on sexuality. Thus, Marx’s theory of the dialectic of perpetual conflict was joined together with Freud’s neurotic ideas, creating a sort of Freudian-Marxism. Their stated goal was a total transformation of society by breaking down traditional norms and institutions such as monogamous relations and the traditional family. This was to be accomplished by promoting and legitimizing unhinged sexual permissiveness with no cultural or religious restraint.