The theoretical basis of the Revolutionary Youth Movement was an insight that most of the American population, including both students and the supposed "middle class," comprised, due to their relationship to the instruments of production, the working class, thus the organizational basis of the SDS, which had begun in the elite colleges and had been extended to public institutions as the organization grew could be extended to youth as a whole including students, those serving in the military, and the unemployed. Students could be viewed as workers gaining skills prior to employment. This contrasted to the Progressive Labor view which viewed students and workers as being in separate categories which could ally, but should not jointly organize.