Born in 1950 in Switzerland, Bréguet was barely 20 years old when he was arrested on June 23, 1970 in Haifa while attempting to dynamite harbour installations. He affirmed that he had been given the responsibility of this mission by the Italian Proletariat Action Group, but denied any ties with Waddi Haddad’s PFLP-COSE. Bréguet was the first European arrested and condemned for pro-Palestinian terrorist activities.

His friend and tireless supporter, François Genoud, organized his defense through an intermediary, his lawyer son-in-law, Maurice Cruchon. Condemned in 1971 to a fifteen-year sentence, Bréguet was eventually pardoned, and was expelled from Israel on the July 24, 1977.

On February 16, 1982, Bréguet and Magdalena Kopp crossed paths with two police agents during a routine check in a parking lot on Avenue Georges V, in Paris. Two bottles of gas, two kilos of explosives linked to a timer (set to go off at ten thirty that night) and two grenades were found in the trunk of their vehicle. Bréguet attempted to open fire on the police officers but his gun jammed.

Genoud asked Vergès to act on behalf of Bréguet and Kopp. On April 22, Bréguet was sentenced to five years in prison, ending up at Fleury-Mérogis in the company of Anis Naccache and Georges Ibrahim Abdallah , all clients of Vergès. Freed on September 17, 1985, he rejoined Carlos in Damascus , settling down a few years later with his family in Greece. On November 12, 1995, a few minutes before leaving on the ferry ‘Le Lato’ en route for Igoumenitsa, he disappeared.

Systematic searches by Greek authorites and Interpol revealed nothing; to this day, his body has not been found.