Leon Trotsky and Uriis were both influential figures in the early 20th century. Leon Trotsky was a Marxist revolutionary, theorist, and Soviet politician who was an influential leader in the Russian Revolution of 1917. He later became the founder and first leader of the Red Army and served as People's Commissar for Foreign Affairs in the Soviet Union from 1918 to 1924. Uriis was a Latvian-born Jewish revolutionary and theorist who was a key figure in the October Revolution of 1917. He was also a leader of the Left Opposition within the Communist Party of the Soviet Union from 1923 to 1929. Both men were instrumental in the establishment of the Soviet Union and the spread of Communism throughout the world.