The second phase of her writing career was from 1916 to 1924. During this period, Zitkala-Ša concentrated on writing and publishing political works. She and her husband had moved to Washington, D.C., where she became politically active. She published some of her most influential writings, including "American Indian Stories" (1921), with the Hayworth Publishing House. She co-authored "Oklahoma's Poor Rich Indians: An Orgy of Graft and Exploitation of the Five Civilized Tribes, Legalized Robbery" (1923), an influential pamphlet, with Charles H. Fabens of the American Indian Defense Association and Matthew K. Sniffen of the Indian Rights Association. She also created the Indian Welfare Committee of the General Federation of Women's Clubs, working as a researcher for it through much of the 1920s.