The League of Socialist Youth of Yugoslavia (SSOJ) was the youth movement, member organisation of the Socialist Alliance of Working People of Yugoslavia (SSRNJ). Membership stood at more than 3.6 million individuals in 1983. It was originally established as the League of Communist Youth of Yugoslavia (SKOJ) on 10 October 1919 and retained that name until 1948. https://en.wikipedia.org/wiki/League_of_Socialist_Youth_of_Yugoslavia