y ▁ ▁Roman ▁Boh nen ▁as ▁W arden ▁A . J . ▁Bar nes ▁ ▁Sir ▁Lan cel ot ▁as ▁Cal y ps o ▁ ▁V ince ▁Bar nett ▁as ▁M ug gs y ▁ ▁Jay ▁C . ▁F li ppen ▁as ▁H od ges ▁- ▁Guard ▁ ▁Richard ▁G aines ▁as ▁Mc Coll um ▁ ▁Frank ▁P ug lia ▁as ▁Ferr ara ▁ ▁James ▁Bell ▁as ▁Cr ens h aw ▁- ▁Con v ict ▁in ▁Print ▁Sh op ▁▁ ▁Howard ▁D uff ▁as ▁Robert ▁" S old ier " ▁Be cker ▁( as ▁Howard ▁D uff ▁- ▁Radio ' s ▁' Sam ▁Sp ade ') ▁ ▁Art ▁Smith ▁as ▁Dr . ▁Wal ters ▁ ▁Whit ▁B iss ell ▁as ▁Tom ▁L ister ▁ ▁Production ▁notes ▁The ▁direct ▁insp iration ▁for ▁the ▁un rem itting ▁des perate ▁violence ▁was ▁the ▁recent ▁" B attle ▁of ▁Al cat raz " ▁( May ▁ 2 – 4 , ▁ 1 9 4 6 ) ▁in ▁which ▁prisoners ▁fought ▁a ▁hop eless ▁two - day ▁battle ▁rather ▁than ▁surrender ▁in ▁the ▁after math ▁of ▁a ▁failed ▁escape ▁attempt . ▁The ▁film ▁has ▁a ▁number ▁of ▁brut al ▁scenes ▁including ▁the ▁cr ushing ▁of ▁a ▁ ▁st ool ▁p ige on ▁prisoner ▁under ▁a ▁stamp ing ▁machine ▁and ▁the ▁be ating ▁of ▁a ▁prisoner ▁bound ▁to ▁a ▁chair ▁by ▁stra ps . ▁Film ▁writer ▁Edd ie ▁M ull er ▁wrote ▁that ▁" the ▁clim ax ▁of ▁Br ute ▁Force ▁displayed ▁the ▁most ▁h arrow ing ▁violence ▁ever