Senator Raúl Ampuero - the national chairman of the party - had long been dealing with Enríquez's public criticism of a party strategy characterised as "reformist" and alien, according to Enríquez, to the working classes' interest. Chairman Ampuero, supported by a majority of the convention delegates, proceeded to marginalize Enríquez and his closest colleagues of the Spartacus cell from the Socialist Party, some of them in strategic leading positions inside the "Comité Regional de la Juventud Socialista". Miguel Enríquez was then 21 years old. In fact, Miguel had already organized (1963) a clandestine fraction called "Movimiento Socialista Revolucionario", or "MSR", integrated by a handful of his peers and his two elder brothers Marco Antonio and Edgardo Enríquez. Edgardo had had the task of developing the MSR fraction at the Socialist Party in Santiago.