 The image for both clubs was further affected by the creation of Ultras groups, some of which became hooligans.In 1980, Ultras Sur was founded as a far-right-leaning Real Madrid ultras group, followed in 1981 by the foundation of the initially left-leaning and later on far-right, Barcelona ultras group Boixos Nois.Both groups became known for their violent acts, and one of the most conflictive factions of Barcelona supporters, the "Casuals", became a full-fledged criminal organisation.