Claim: Rudolf Nilsen, a child of the working class, decided to join the Communist Party of Norway, a small Marxist–Leninist communist party in Norway, and their youth league Young Communist League of Norway when the Norwegian Labour Party split up in 1923.
Evidence: A child of the working class, Nilsen became part of the left-wing revolutionary movement and joined the organisation Norges Socialdemokratiske Ungdomsforbund (Social Democratic Youth League of Norway), the youth league of the Norwegian Labour Party. When the Norwegian Labour Party split up in 1923, due to an ideological schism, Nilsen decided to join the Communist Party of Norway, and their youth league Young Communist League of Norway. The Communist Party of Norway (Norwegian: Norges Kommunistiske Parti) is a small Marxist–Leninist communist party in Norway.