Before the war he was a scholarship student at the Franciscan college of Široki Brijeg in Herzegovina and a member of The Great Brotherhood of Crusaders.
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He spent some time studying law in Zagreb where he became the Ustashe Youth member and later a member of the Croatian fascist Ustaša government (1941-1945) and one of the guards in the Jasenovac concentration camp.
Petar Brzica was an Ustaša officer who, on the night of 29 August 1942, allegedly slaughtered over 1,360 people.
Petar Omčikus | Petar II Petrović-Njegoš | Petar Gudev | Petar Kočić | Petar Dobrović | Petar Dachev | Petar Dobrovic | Petar Beron | Sveti Petar u Šumi | Sveti Petar Orehovec | Sveti Petar Čvrstec | Sveti Petar | Petar Zrinski | Petar Stojkoviḱ | Petar Radev | Petar Mrkonjić | Petar I Petrović-Njegoš | Petar Drapšin | Petar Brzica | Petar Beron (politician) |