Near the end of 1968, Tropicália experienced a shift to a more overt association with international countercultures and movements, most notably that of African American Black Power in the United States. The movement was becoming increasingly leftist, and pushed for artistic output. At a later Tropicália concert in the same year, during a performance by Caetano Veloso, a riot erupted in the auditorium between tropicalists and supporters of nationalist-participant music. The nationalists were primarily college students, and the uproar culminated with screams and hurling garbage at Veloso. The nationalist-participant group's resistance of the movement was nothing new, but this incident was the tipping point of their opposition. At the nightclub Sucata, Tropicália shows became increasingly resistant to Brazil's military-run society. Due to Veloso's refusal to censor the shows to government wishes, the military began to monitor Tropicália events. On December 27, 1968, at the peak of government repression, Caetano Veloso and Gilberto Gil were arrested, detained, and exiled to London for two and a half years.