In 1964 Rousseff left the conservative Colégio Sion and joined the Central State High School, a co-ed public school where the students often protested against the dictatorship that had been established after the 1964 Brazilian coup d'état. In 1967 she joined Worker's Politics (), an organization founded in 1961 as a spinoff of the Brazilian Socialist Party. Its members found themselves divided over methods; some wanted to advocate for the election of a constituent assembly, but others advocated an armed struggle. Rousseff joined the second group, which became the National Liberation Command (). According to , leader of Colina in 1968 who taught Marxism to Rousseff in high school, she chose armed struggle after reading "Revolution inside the Revolution" by Régis Debray, a French intellectual who had moved to Cuba and become a friend of Fidel Castro and Che Guevara. Heringer says that "the book inflamed everybody, including Dilma".