rewis argued january decided april petitioners conducted lottery operation florida near georgia border convicted along two georgia residents placed bets petitioners establishment violating travel act prohibits interstate travel intent promote manage establish carry facilitate certain illegal activity district instructed jury georgia bettors traveled florida purpose gambling violated act defendant found guilty aiding abetting statute without proof personally performed every act constituting charged offense appeals reversed convictions georgia bettors holding make federal crime merely cross state line place bet upheld petitioners convictions ground gambling establishment operators responsible interstate travel customers held conducting gambling operation frequented bettors without constitute violation travel act pp reversed marshall delivered opinion members joined except white took part decision case albert datz argued cause filed briefs petitioners sidney glazer argued cause brief solicitor general griswold assistant attorney general wilson beatrice rosenberg michael kelly justice marshall delivered opinion case petitioners challenge convictions travel act prohibits interstate travel furtherance certain criminal activity although appeals fifth circuit narrowed expansive interpretation act appeals affirmed petitioners convictions reasons stated reverse petitioners james rewis mary lee williams convicted along two defendants district middle district florida convictions arose lottery numbers operation petitioners admittedly ran yulee florida small community located miles south state line petitioners florida residents evidence time crossed state lines connection operation lottery two convicted defendants georgia residents traveled georgia homes place bets petitioners establishment yulee district instructed jury mere bettors lottery violated florida law bettors traveled interstate purpose gambling also violated travel act presumably referring petitioners district charged defendant found guilty aiding abetting statute without proof personally performed every act constituting charged offense appeal fifth circuit held make federal crime merely cross state line purpose placing bet reversed convictions two georgia residents evidence presented trial insufficient show anything customers gambling operation however appeals upheld petitioners convictions ground operators gambling establishments responsible interstate travel customers agree appeals said certainty sufficient justify criminal conviction congress intended interstate travel mere customers gambling establishment violate travel act unable conclude conducting gambling operation frequented bettors violates act section prohibits interstate travel intent promote manage establish carry facilitate certain kinds illegal activity ordinary meaning language suggests traveler purpose must involve desire patronize illegal activity legislative history act limited reveal aimed primarily organized crime specifically persons reside one state operating managing illegal activities located another addition struck congress say given ease citizens nation able travel existence many multistate metropolitan areas substantial amounts criminal activity traditionally subject state regulation patronized customers context congress certainly recognize expansive travel act alter sensitive relationships overextend limited federal police resources might well produce situations geographic origin customers matter happenstance transform relatively minor state offenses federal felonies us weigh merits factors fact even discussed legislative history strongly suggests congress intend travel act apply criminal activity solely activity times patronized persons another state short neither statutory language legislative history supports interpretation even lack support less apparent ambiguity concerning ambit criminal statutes resolved favor lenity bell government concedes much offers alternative construction travel act act violated whenever operator illegal establishment reasonably foresee customers cross state lines purpose patronizing illegal operation whenever operator actively seeks attract business another state first half proposed interpretation reasonable foreseeability interstate patronage merit acceptance whenever individuals actually cross state lines purpose patronizing criminal establishment almost always reasonable say operators establishment foreseen customers come state practical purposes alternative construction almost expansive interpretations already rejected addition little evidence congress intended foreseeability govern criminal liability may however greater support second half government proposed interpretation active encouragement interstate patronage violates act course conduct deemed constitute active encouragement must merely conducting illegal operation otherwise interpretation restate constructions rejected still cases federal courts correctly applied individuals whose agents employees cross state lines furtherance illegal activity see chambers barrow cert denied zizzo cert denied government argues principles decisions extended cover persons actively seek interstate patronage although cited cases gone far although much said casts substantial doubt government broad argument may occasional situations conduct encouraging interstate patronage closely approximates conduct principal criminal agency relationship travel act violated need rule part government theory interpretation petitioners convicted jury charged must find petitioners actively sought interstate patronage informed action petitioners actually conducting lottery designed attract customers result government proposed interpretation travel act employed uphold convictions reversed footnotes petitioners convicted eight substantive violations conspiracy violate section petitioner rewis sentenced five years imprisonment count run concurrently petitioner williams sentenced three years imprisonment count run concurrently subject parole petitioner rewis also convicted two counts failed purchase wagering tax stamp latter two convictions reversed appeals intervening decisions marchetti grosso provides whoever commits offense aids abets counsels commands induces procures commission punishable principal whoever willfully causes act done directly performed another offense punishable principal government sought review part appeals decision reversing conviction two georgia residents parties correctly concede questions case solely statutory issue constitutional dimension presented incorporated senate report dated july following appears bill introduced chairman committee senator james eastland april recommendation attorney general robert kennedy part attorney general legislative program combat organized crime racketeering attorney general testified committee support bill june commented seeking take effective action racketeer conducts unlawful business lives far scene comfort safety well hoodlums let say outset seek intend impede travel anyone except persons engaged illegal businesses spelled bill target clearly organized crime travel banned travel furtherance business enterprise involves gambling liquor narcotics prostitution offenses extortion bribery obviously trying curtail sporadic casual involvement offenses rather continuous course conduct sufficient termed business enterprise investigations also made quite clear federal government shut funds permit top men organized crime live far scene therefore remain immune local officials