The Singular Systems of Vigilance and Protection ("Sistema Unico de Vigilancia y Protección, SUVP") reach across several state institutions, including the Communist Party, the police, the CDRs, the state-controlled labor union, student groups, and members of mass organizations. The government calls on SUVPs to carry out surveillance and to intimidate opposition activists. Rapid Action Brigades ("Brigadas de Acción Rápida", also referred to as Rapid Response Brigades, or "Brigadas de Respuesta Rápida") are groups of government organized civilians that observe and control dissidents.