Around this time, tensions began to arise between what was perceived as president Núñez's dictatorial rule and the nationalistic support group, Boixos Nois. The group, identified with a left-wing separatism, repeatedly demanded the resignation of Núñez and openly defied him through chants and banners at matches. At the same time, Barcelona experienced an eruption in skinheads, who often identified with a right-wing separatism. The skinheads slowly transferred the Boixos Nois' ideology from liberalism to fascism, which caused division within the group and a sudden support for Núñez's presidency. Inspired by British hooligans, the remaining Boixos Nois became violent, causing havoc leading to large-scale arrests.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What did the resulting violence perpetrated by the extremists produce?
large-scale arrests