In order to understand the development of the Catholic Worker Movement’s ideology and leadership pattern, an examination of the group’s history under the direction of Maurin and Day, and later by Day alone, is presented. Aspects discussed in this chapter include the social context in which the Movement was founded, the ideology upon which it was established, the publication of the Catholic Worker newssheet, the eventual opening of houses of hospitality, clarification of thought seminars, communal farms, and finally its unwavering pacifist positions held from the Ethiopian and Spanish Civil War to include the Vietnamese War and protest of the development of nuclear armaments.