ini ▁was ▁phys ically ▁be aten ▁by ▁F asc ist ▁squad s ▁on ▁several ▁occasions , ▁but ▁never ▁lost ▁faith ▁in ▁his ▁ide als . ▁ ▁Res istance ▁to ▁F asc ism ▁ ▁After ▁the ▁assass ination ▁of ▁PS U ▁leader ▁Gia como ▁Mat te otti ▁by ▁F asc ists ▁in ▁the ▁ 1 9 2 4 , ▁P ert ini ▁became ▁even ▁more ▁committed ▁to ▁the ▁struggle ▁against ▁the ▁total itar ian ▁regime . ▁In ▁ 1 9 2 6 , ▁he ▁was ▁sent enced ▁to ▁intern ment , ▁but ▁managed ▁to ▁go ▁into ▁hiding . ▁Later , ▁together ▁with ▁Carlo ▁Ross elli ▁and ▁Fer ru c cio ▁Par ri , ▁he ▁organized ▁and ▁accompanied ▁the ▁escape ▁to ▁France ▁of ▁Fil ipp o ▁Tur ati , ▁who ▁was ▁the ▁most ▁prominent ▁figure ▁of ▁the ▁PS U . ▁P ert ini ▁remained ▁in ▁the ▁country ▁until ▁ 1 9 2 6 ▁working ▁as ▁a ▁m ason . ▁On ▁his ▁return ▁to ▁Italy , ▁he ▁was ▁arrested ▁in ▁P isa ▁and ▁sent enced ▁to ▁ten ▁years ' ▁imprison ment . ▁ ▁In ▁ 1 9 3 5 ▁he ▁was ▁intern ed ▁on ▁Santo ▁Stef ano ▁Island , ▁Vent ot ene ▁( LT ), ▁Pont ine ▁Islands , ▁an ▁island ▁in ▁the ▁T yr r hen ian ▁Sea , ▁where ▁he ▁remained ▁through ▁Italy ' s ▁entry ▁into ▁World ▁War ▁II ▁and ▁until ▁ 1 9 4 3 . ▁There ▁he ▁saved ▁the ▁famous ▁di aries ▁of ▁Antonio ▁Gr ams ci . ▁Although ▁he ▁had