After the founding of the People's Republic of Albania on 11 January 1946, he was elected Colonel Chief of Section of Counterintelligence in the Directorate for External Security.

He was the chief of the Directorate of State Security (the Sigurimi), Albania's secret police, and Deputy Internal Affairs Minister from 1950 to 1954.

As Internal Affairs Minister during the mid-1970s, he was instrumental in the dismissal, arrest, and execution of the alleged conspirators of the military-economic spectrum such as Beqir Balluku, Petrit Dume, Hito Çako, Abdyl Këllezi, Koço Theodhosi, Kiço Ngjela, and Lipe Nashi.

[3] Hazbiu's appointment as Defense Minister was surprising, but followed a direct decision taken by the First Secretary of the PPSh Enver Hoxha, and F. Shehu's incapability to compare with major Defense Department Deputy Ministers' experience (Llambi Gegprifti, Nazar Berberi, Maliq Sadushi, or Veli Llakaj wanted to run for the post).

On 23 November 1982, he was officially replaced by Prokop Murra as Minister of Defence, the first civilian to hold such a post of the People's Republic of Albania.

All were under Shehu's line on influence,[1] and were accused of relations with the CIA, the Yugoslav UDB, and the KGB,[5] allegedly having plotted a coup d'etat for the liquidation of Hoxha.