The International Association of Red Sports and Gymnastics Associations, commonly known as Red Sport International (RSI) or Sportintern was a Comintern-supported international sports organization established in July 1921. The RSI was established in an effort to form a rival organization to already existing "bourgeois" and social democratic international sporting groups. The RSI was part of a physical culture movement in Soviet Russia linked to the physical training of young people prior to their enlistment in the military. The RSI held 3 summer games and 1 winter games called "Spartakiad" in competition with the Olympic games of the International Olympic Committee before being dissolved in 1937.

The Communist International (Comintern), also known as the Third International, was an international organization founded in 1919 that advocated world communism, and which was led and controlled by the Communist Party of the Soviet Union. The Comintern resolved at its Second Congress in 1920 to "struggle by all available means, including armed force, for the overthrow of the international bourgeoisie and the creation of an international soviet republic as a transition stage to the complete abolition of the state". The Comintern was preceded by the dissolution of the Second International in 1916. Vladmir Lenin and Leon Trotsky were both honorary presidents of the Communist International.