The Third International, also known as the Comintern, was an organization founded in 1919 to promote worldwide communism. It aimed to unite various socialist and communist parties across the globe under the leadership of the Bolshevik Party in Russia, following the success of the October Revolution in 1917. The Comintern sought to encourage revolutionary movements and establish communist governments in different countries. The Third International held several congresses, where strategies and policies were discussed to advance the communist cause. It played a significant role in shaping the global communist movement until its dissolution in 1943, largely due to the changing political landscape during and after World War II.