Raggare! (1959)
Raggare! (in Great Britain released as Blackjackets) is a 1959 Swedish drama film directed by Olle Hellbom, about a gang of car driving youngsters (greasers) who hang out in a café outside Stockholm. The coolest among the youngsters, Roffe, kidnaps his girlfriend when discovering that she hangs out with guys from another gang.
More at Wikipedia.