In 1962, during his second year at the university in Concepción, Miguel officially entered the youth organization of the Chilean Socialist Party (Federación Juvenil Socialista, FJS) together with his brother M. Antonio and some close peers of the medical school. Enríquez' first political activities are conducted in the Spartacus cell ("núcleo Espartaco"), a cell organized in advance by his friend Marcello Ferrada de Noli who for that purpose had entered the Socialist Party a year before. The group became integrated by Miguel Enríquez and his brother Marco Antonio, his old-time friends Bautista van Schouwen Vasey and Marcello Ferrada de Noli (cell's leader), Martin Hernández, and a new university peers Miguel had met at the University of Concepción (Jorge Gutiérrez Correa). All these young men - except Martin Hernández - left the Socialist Party together with Miguel Enríquez in January 1964 amid a stormy National Convention held in the southern city of Concepción.