Kitty Harris was a Soviet secret agent. Born to a poor Jewish family in Winnipeg, Canada she became a dedicated socialist and became active in the Industrial Workers of the World and a leader of the 1919 Winnipeg General Strike. When in the years afterwards the IWW was broken up and accused of communist leanings, Harris became radicalized and left the group. She became involved with another former Wobbly who had links to Moscow. When he went to China, Harris joined him and began to serve him as a covert messenger.

Her ability was noted by the Comintern and sent to Berlin where she performed a number of duties. When Nazi anti-Semitism made her position too risky she was transferred to Britain where she became a part of the team funneling information from the Cambridge Five back to Moscow. She eventually became Donald Duart Maclean's main contact.

In 1941 Harris was sent to the United States as part of the operation against the Manhattan Project. Her role in this operation is still unknown. After violating protocol by meeting with her parents, she was transferred to Mexico after the war.

She became ill however and it was decided that she should be retired from active service. She was given an apartment in Riga. Soon after she developed problems with alcoholism and mental illness. She died only a few years later.