Abstract This article investigates the security sector in Somalia, with a focus on the National Intelligence and Security Agency (NISA), a government security unit, involved in the fight against the Al-Shabaab insurgency. This article argues that the historically traumatic legacy of autocratic oppression of the former military regime gives the Somali intelligence agency an infamous reputation that survives today and plays a significant role in the operations of the intelligence agency. Intelligence agents employ tactics from the late Cold War era military regime’s intelligence services, suggesting striking historical continuities of the military regime in practice and performance. The empirical data also shows that NISA is enmeshed in the ‘dirty war’ between the federal government and Al-Shabaab. Not only does the intelligence agency normalize extrajudicial activities to serve the agenda of political authorities and to suppress their critics, but it also financially benefits from arrests without trials. NISA agents harass the public and political opposition groups daily and brutally suppress mass media and freedom of speech, especially in the government-controlled areas in Mogadishu. As the first empirical academic investigation into NISA, the article contributes to broader debates on intelligence, the anthropology of the state, security studies, and institution- and state-building in violent environments.