Every German youth was a member of the Hitler Youth. It was mandatory.
And they were mean little bastards. In high school, my 7th grade math tercher was a P.O.W. for 19 months. He escaped and was later caught. He said that the Germans assigned some Hitler youth to guard him until the German military could come and get him. He said that they treated him rougher than any German soldier ever had or did.
I wouldn’t say it was the best movie ever, but the movie “Swing Kids” is probably the best example of showing how things worked as far as pressuring kids to join the HJ.