Papers of the author and government official, active in the areas of immigration, labor relations, and social welfare. Correspondence (1922-1965); writings (1922-1956); organizational activities files (1918-1965); and published material (1931-1966). Notable correspondents include the America-Italy Society, Inc., American Council for Nationalities Service, American Federation of International Institutes, American Museum of Immigration, Anthony Celebrezze, Common Council for American Unity, Allen W. Dulles, John Foster Dulles, W. Averell Harriman, Herbert Hoover, Italian Historical Society of America, Irving M. Ives, Jacob K. Javits, Fiorello H. La Guardia, La Guardia Memorial House, Inc., William Lescaze, National Committee on Immigration Policy, National Council on Naturalization and Citizenship, Order Sons of Italy in America, Frances Perkins, Republican Party, Nelson A. Rockefeller, Howard A. Smith, Ralph W. Sockman, United Neighborhood Houses of New York, Inc., U.S. Immigration and Naturalization Service, and others.