How Portugal's Intelligence Service Rose From Revolution to Stability

Portugal's modern intelligence service traces its roots to the turbulent months following the 1974 revolution. After the fall of the authoritarian Estado Novo regime, the country faced a power vacuum that delayed the creation of a stable civilian-led security system. A new podcast, SIS: 40 Years of Secrets, now explores this complex history, from the chaotic early days to the service's eventual establishment in 1986.

The collapse of the Estado Novo on 25 April 1974 triggered immediate changes. By 2 May, the feared political police, Direção-Geral de Segurança (DGS), was dissolved by decree. Its archives were seized, and staff were purged during the transition. The void left behind led to months of instability, with military factions vying for control and leftist groups attempting to influence intelligence structures.

On 25 October 1974, under Prime Minister Vasco Gonçalves, the civilian **Serviço de Informações de Segurança (SIS)** was formally created. Yet the path to stability remained rocky. Internal military conflicts—such as the rivalry between the Spinola and Gonçalves factions—alongside violent episodes like the 25 November 1975 counter-coup, shaped the service's early years. Intelligence operations initially fell under military oversight, but the lack of resources and expertise left Portugal vulnerable to Cold War espionage, terrorism, and the fallout from African decolonisation. It took over a decade for the system to mature. In 1986, the **Security and Intelligence Service (SIS)** was officially launched, marking the start of a structured, civilian-led agency. The podcast *SIS: 40 Years of Secrets* delves into these developments, featuring interviews with key figures who detail the service's founding, training methods, and oversight mechanisms.

The transition from military control to a professional civilian intelligence service took years of political struggle. The SIS eventually emerged as Portugal's primary security agency, tasked with addressing modern threats. The podcast now provides a firsthand account of its formation, offering rare insights into a previously classified chapter of the nation's history.