A 1999 Human Rights Watch report notes that the Interior Ministry's principal responsibility is to monitor the Cuban population for signs of dissent.  In 1991 two new mechanisms for internal surveillance and control emerged. Communist Party leaders organized the Singular Systems of Vigilance and Protection (Sistema Unico de Vigilancia y Protección, SUVP). Rapid Action Brigades (Brigadas de Acción Rapida, also referred to as Rapid Response Brigades, or Brigadas de Respuesta Rápida) observe and control dissidents.  The government also "maintains academic and labor files (expedientes escolares y laborales) for each citizen, in which officials record actions or statements that may bear on the person's loyalty to the revolution. Before advancing to a new school or position, the individual's record must first be deemed acceptable".