On 20th December 1974, five members of the Movimiento de Liberación Nacional-Tupamaros (National Liberation Movement-Tupamaros, MLN-T) were assassinated close to the small city of Soca (Canelones Department, Uruguay).

Between 27th February and 4th March 1974, a meeting took place in Buenos Aires between the heads of the region’s police forces. During the meeting, it was agreed that the Argentine Federal Police would cooperate with its counterparts in Bolivia, Chile, Paraguay and Uruguay. During this summit of police authorities, the attendees shared their experience with the aim of deepening their joint participation in antisubversive operations.