In 1956 Cabral was one of the six founders of the African Party for the Independence of Guinea and Cape Verde (PAIGC). In the early 1960s, PAIGC launched an anti-colonial guerrilla war against the Portuguese authorities. He helped organize a dock strike that was brutally suppressed by the Portuguese authorities. and resulted in a loss of more than 50 lives. This led to the PAIGC abandoning non-violence, which came as a shock to Cabral. Luís Cabral's rise to leadership began in 1973, after the assassination in Conakry, Guinea, of his half-brother Amílcar Cabral, the noted Pan-African intellectual and founder of the PAIGC. Leadership of the party then engaged in fighting for independence from Portuguese rule for both Guinea-Bissau (then known as Portuguese Guinea) and for Cape Verde, fell to Aristides Pereira, who later became the president of Cape Verde. The Guinea-Bissau branch of the party, however, followed Luís Cabral.