Bethlehem Center and Howell House were church-related neighborhood houses serving the Pilsen area on the Near West Side. They provided religious, social services, and personal welfare assistance to an immigrant community composed predominantly of Bohemians, Poles, and Czechs. The two centers cooperated throughout their history, merging in 1961 as the Neighborhood Service Organization. The Neighborhood Service Organization, popularly known as Casa Aztlan, continues to serve the Pilsen area.