The Servicio de Inteligencia Militar (SIM) (English: Military Intelligence Service) was the main secret police force and death squad during the later part of the dictatorship of Rafael Trujillo to keep control within the Dominican Republic.
Around 1957 the Department of State for Security, headed by General Arturo Espaillat was dissolved, replaced by SIM and its sister agency, the Servicio Central de Inteligencia (SCI).
[1] Under the leadership of Johnny Abbes García, SIM employed thousands of people and was involved in immigration, passports, censorship, supervision of aliens, and undercover work.
[1] In the population members of SIM were known as "caliés" (Thugs), they patrolled the streets in their black VW beetles called "cepillos" (brushes).
SIM and its leader Johnny Abbes García are frequently mentioned in Mario Vargas Llosa's historical novel The Feast of the Goat and in Julia Alvarez's novel In the Time of the Butterflies.