Around 4% of Resistance forces were formally Catholic organisations, but Catholics dominated other "independent groups" such as the Fiamme Verdi and Osoppo partisans, and there were also Catholic militants in the Garibaldi Brigades, such as Benigno Zaccagnini, who later served as a prominent Christian Democrat politician.[20] In Northern Italy, tensions between Catholics and communists in the movement led Catholics to form the Fiamme Verdi as a separate brigade of Christian Democrats.[21] After the war, the ideological divisions between former partisans re-emerged, becoming a hallmark of post-war Italian politics.[22]