In 1914 Kenny, living in New York, was again the president of the Clan-na-Gael. He was also the vice-president of the I.R.B. Veterans, a founding member of the Irish Volunteers Committee (the provisional committee formed to arm the Irish Volunteers Irish National Volunteers in Ireland), a founder of the Land League (and in 1916 of the Friends of Irish Freedom), and an active supporter of Padraic Pearse's St. Enda's School and the women's organisation the Cumann na mBan. He also served as the Business Manager of the Gaelic American newspaper, and later as a founder of the Friends of Irish Freedom
