The term "New Left" came into common use in the 1960`s to describe activists for social change who did not accept the economic dogmas of the Old Left, which centered on class struggle and unionization. The strength of the New Left was derived primarily from campuses, and it thrived in the midst of the political and social turmoil of the decades of the 1960`s and 1970`s. Herbert Marcuse is sometimes called the "Father of the New Left."