▁begun ▁suffering ▁from ▁severe ▁ill ness , ▁P ert ini ▁never ▁demanded ▁p ardon . ▁He ▁was ▁released ▁a ▁month ▁after ▁Ben ito ▁M uss ol ini ' s ▁arrest , ▁and ▁joined ▁the ▁Italian ▁resistance ▁movement ▁against ▁the ▁Naz i ▁German ▁occup iers ▁and ▁M uss ol ini ' s ▁new ▁regime ▁– ▁the ▁Italian ▁Social ▁Republic . ▁Arr ested ▁by ▁the ▁Germ ans , ▁he ▁was ▁sent enced ▁to ▁death ▁but ▁fre ed ▁by ▁a ▁part isan ▁ra id . ▁P ert ini ▁then ▁travel led ▁north ▁to ▁organ ize ▁part isan ▁war ▁as ▁an ▁executive ▁member ▁of ▁PS U ▁( al ong side ▁Rod ol fo ▁Mor and i ▁and ▁L el io ▁B asso ). ▁ ▁Prom in ence ▁ ▁After ▁the ▁war ▁ended ▁in ▁Italy ▁on ▁ 2 5 ▁April ▁ 1 9 4 5 ▁and ▁the ▁mon archy ▁was ▁abol ished ▁through ▁the ▁ 1 9 4 6 ▁Italian ▁constitution al ▁refer endum , ▁P ert ini ▁was ▁elected ▁to ▁the ▁Const itu ent ▁Assembly ▁( La ▁Cost itu ente ), ▁the ▁body ▁that ▁prepared ▁the ▁new ▁republic an ▁Italian ▁Constitution . ▁In ▁the ▁post war ▁era ▁he ▁was ▁a ▁prominent ▁member ▁of ▁the ▁directive ▁board ▁of ▁the ▁Italian ▁Social ist ▁Party ▁( the ▁P SI , ▁which ▁the ▁PS U ▁had ▁rejo ined ). ▁ ▁In ▁spite ▁of ▁his ▁in trans igent ▁attitude ▁toward ▁the ▁Italian ▁Commun ist ▁Party , ▁P ert ini ▁was ▁susp icious ▁of ▁many ▁policies ▁enfor ced ▁by ▁the ▁P SI .