The Ware group was a covert organization of Communist Party USA operatives within the United States government in the 1930s, run first by Harold Ware and then by Whittaker Chambers after Ware's accidental death on August 13, 1935.
Harold Ware founded this group. Ware was a Communist Party (CP) official working for the federal government in Washington, D.C. By 1934, the group had grown to some 75 members, divided into cells. Members initially joined Marxist study groups and then into activities on behalf of the Party. They shared a belief that Marxist ideologies were the correct way to approach the problems of the ongoing Great Depression. Whittaker Chambers also stated that Ware could have been acting "pursuant to orders from the Central Committee of the Communist Party of the United States".
The Ware group started among young lawyers and economists hired by the Agricultural Adjustment Administration (AAA). This New Deal agency reported to the Secretary of Agriculture but was operated independently of Department of Agriculture bureaucracy. All the members of the Ware Group were dues paying members of the Communist Party. J. Peters considered the Ware Group one of his major sources of income. Nathaniel Weyl felt that members of the Ware Group were acquiring "the training in the complex business of running a state that would be in high demand and short supply when the United States chose Socialism", that "in a Communist regime they would be poised to move to the head of the table."
Alleged members of the Ware group include:
In 1950, Lee Pressman testified to Congress and confirmed his membership in the Ware Group. Nathanial Weyl also confirmed his membership in the group, and said Hiss had been a fellow member.  In 1993, John Abt wrote in his memoirs that the Ware Group was a Communist Party unit and that he had been a member. In 1994, Hope Hale Davis, a former Communist, also acknowledged that the Ware Group was a CPUSA unit, and she knew most of the people Chambers had named as fellow Communists and unit members.
Ware died of injuries sustained in an automobile accident near Harrisburg, Pennsylvania, in August 1935.
- Gall, Gilbert J. "A Note on Lee Pressman and the FBI." Labor History. 32:4 (Autumn 1991).
- NYU, Chambers, August 28, 1946
- Alger Hiss: Why He Chose Treason. Christina Shelton. Simon and Schuster. 2012.
- Red Conspirator: J. Peters and the American Communist Underground. Thomas L. Sakmyster. University of Illinois Press. 2011.
- Chambers, Whittaker (1952). Witness. New York: Random House. pp. White on 29, 40, 67–68, 69, 70, 334, 370 383–384, 386, 405, 414–416, 419–421, 423, 426, 427, 429–432, 442, 470, 492, 500, 510–512, 544, 554, 600–; handover from Ware to Chambers on 31, 204, 332–348, 350, 352, 361, 370, 377, 378, 467, 542, 543, 552, 553, 624, 685, 686.
- Hearings Regarding Communism in the United States Government — Part 2, pg. 2845.
- "Another Witness". TIME. March 3, 1952. Retrieved 2014-09-02.
- Hewitt, Alan (January 9, 1953). "I Was in a Communist Unit with Hiss". U.S. News and World Report. Retrieved 2014-09-02.
- Abt, John (1993). Advocate and Activist: Memoirs of an American Communist Lawyer. Champaign, IL: University of Illinois Press. ISBN 978-0-2520-2030-8.
- Davis, Hope Hale (1994). Great Day Coming. Hanover NH: Steerforth Press. ISBN 978-1-8836-4217-4.