▁to ▁Canada . ▁In ▁ 1 9 1 6 ▁he ▁became ▁the ▁mayor ▁of ▁the ▁Canadian ▁town ▁Spirit ▁River , ▁Al berta . ▁While ▁discovered ▁by ▁the ▁Royal ▁Canadian ▁Mount ed ▁Police ▁and ▁the ▁F BI ▁in ▁ 1 9 3 3 , ▁serious ▁doub ts ▁about ▁his ▁original ▁conv iction ▁led ▁the ▁U . S . ▁to ▁drop ▁its ▁extr ad ition ▁request ▁in ▁ 1 9 3 4 . ▁Gr ig ware ▁never ▁returned ▁to ▁the ▁U . S . ▁and ▁died ▁in ▁Al berta ▁in ▁ 1 9 7 7 . ▁ ▁Bas il ▁Bang hart ▁escaped ▁from ▁Le aven worth ▁a ▁total ▁of ▁ 3 ▁times . ▁ ▁He ▁escaped ▁federal ▁cust ody ▁a ▁fourth ▁time ▁while ▁await ing ▁return ▁to ▁Le aven worth . ▁▁ ▁Frank ▁Nash , ▁George ▁" Machine ▁Gun " ▁Kelly ▁and ▁Thomas ▁James ▁Hold en ▁assist ed ▁ 7 ▁in m ates ▁in ▁taking ▁W arden ▁Thomas ▁B . ▁White ▁host age , ▁and ▁escaped ▁on ▁December ▁ 1 1 , ▁ 1 9 3 1 . ▁ ▁Exec utions ▁On ▁September ▁ 5 , ▁ 1 9 3 0 , ▁serial ▁k iller ▁Carl ▁P anz ram , ▁under ▁a ▁federal ▁death ▁sentence ▁for ▁murder , ▁was ▁h anged ▁at ▁US P ▁Le aven worth . ▁On ▁August ▁ 1 2 , ▁ 1 9 3 8 , ▁two ▁men ▁under ▁the ▁sentence ▁of ▁death ▁for ▁murder ▁— ▁Robert ▁Su h ay ▁and ▁Gl enn ▁App legate ▁— ▁were ▁h anged ▁at ▁US