Frankfurt School, group of researchers associated with the Institute for Social Research in Frankfurt am Main, Germany, who applied Marxism to a radical interdisciplinary social theory. The Institute for Social Research (Institut für Sozialforschung) was founded by Carl Grünberg in 1923 as an adjunct of the University of Frankfurt; it was the first Marxist-oriented research centre affiliated with a major German university. Max Horkheimer took over as director in 1930 and recruited many talented theorists, including T.W. Adorno, Erich Fromm, Herbert Marcuse, and Walter Benjamin.
Karl Marx and Friedrich Engels 1927 David Riazanov
State Militia Intelligence 