Georgi Mikhailovich Dimitrov (Radomir June 18, 1882 - Moscow July 2, 1949) Bulgarian Communist leader. Dimitrov returned to the Soviet Union, and from 1935 he served as the Secretary-General of the Comintern, until the public disbanding of it by Stalin in 1943. The Comintern did continue to operate underground.
In 1935, Dimitrov was elected General Secretary of the Executive Committee of the Communist International. He waged a persistent struggle for the creation and consolidation of the united proletarian and popular front for the struggle against fascism, against the war which the fascist rulers of Germany, Japan and Italy were preparing. He called untiringly on the masses of the working people of all countries to rally around the Communist Parties in order to bar the way to the Fascist aggressors. 
In 1939, Dimitrov sent a ciphered message to CPUSA General Secretary Earl Browder explaining that the Communist Party of the United States line supporting the Nazi-Soviet Pact was not fully correct because while it broke with U.S President Franklin Roosevelt’s policy of supporting Britain and France in their resistance to Nazi aggression, it failed to take the additional step of breaking with FDR's domestic policies as well. Browder and the CPUSA immediately made the required changes in its policies.
- Obituary of G.M. Dimitrov
- The “Mental Comintern” and the Self-Destructive Tactics of CPUSA, 1945-1958, By John Earl Haynes, delivered at Institute of National Remembrance, Poland, 28 September 2007.