void ▁of ▁party ▁affili ations , ▁Ben ito ▁M uss ol ini ▁belonged . ▁ ▁History ▁ ▁World ▁War ▁I ▁ ▁On ▁ 1 8 ▁August ▁ 1 9 1 4 ▁Italian ▁synd ical ist ▁Alc este ▁de ▁Am br is , ▁speaking ▁from ▁the ▁ro str um ▁of ▁the ▁Milan ese ▁Sy nd ical ▁Union ▁( US M ), ▁began ▁a ▁f ero cious ▁attack ▁against ▁neutral ity ▁in ▁World ▁War ▁I ▁and ▁ur ged ▁inter vention ▁against ▁German ▁reaction ▁and ▁the ▁necessity ▁of ▁a iding ▁France ▁and ▁the ▁United ▁Kingdom . ▁He ▁equ ated ▁the ▁war ▁with ▁the ▁French ▁Revolution . ▁ ▁This ▁caused ▁a ▁deep ▁split ▁within ▁the ▁Un ione ▁S ind ac ale ▁Italiana ▁( US I ). ▁The ▁majority ▁opt ed ▁for ▁neutral ity . ▁The ▁Par ma ▁Labor ▁Chamber , ▁the ▁US M , ▁and ▁other ▁radical ▁synd ical ists ▁left ▁the ▁US I ▁and ▁on ▁ 1 ▁October ▁ 1 9 1 4 ▁founded ▁the ▁F as ci ▁d ' A zione ▁riv ol uz ion aria ▁intern az ional ista . ▁On ▁October ▁ 5 ▁Ang elo ▁Oliv iero ▁Oliv etti ▁published ▁their ▁manif esto ▁in ▁the ▁first ▁issue ▁of ▁a ▁new ▁series ▁of ▁P agine ▁lib ere . ▁Ben ito ▁M uss ol ini ▁shortly ▁there after ▁joined ▁this ▁group ▁and ▁took ▁leadership . ▁ ▁M uss ol ini ' s ▁split ▁ ▁On ▁ 1 1 ▁December ▁ 1 9 1 4 ▁M uss ol ini ▁started ▁a ▁political ▁group , ▁F as