The long march through the institutions.
Der lange Marsch durch die Institutionen.
Original text (German)
Source, in full
Socialist slogan, coined c. 1967 to describe his strategy to create radical change in government by infiltrating and eventually controlling its institutions. The idea refers to the physical Long March of the Chinese communist army. See: Herbert Marcuse, Counterrevolution and Revolt (Boston, MA: Beacon Press, 1972), p. 336