▁the ▁Inter ior ▁Harold ▁L . ▁I ck es ▁refused ▁to ▁construct ▁the ▁pipeline ▁because ▁of ▁the ▁opposition ▁by ▁Big ▁O il . ▁ ▁R ivers ' s ▁first ▁major ▁success ▁was ▁the ▁repe al ▁of ▁the ▁federal ▁tax ▁on ▁colored ▁o le om arg ar ine . ▁The ▁tax ▁was ▁first ▁implemented ▁because ▁marg ar ine ▁was ▁a ▁much ▁che aper ▁substitute ▁of ▁but ter ▁which ▁threatened ▁the ▁interests ▁of ▁the ▁da iry ▁far mers . ▁When ▁R ivers ▁first ▁introduced ▁the ▁bill ▁in ▁ 1 9 4 4 ▁to ▁repe al ▁the ▁tax , ▁it ▁was ▁vig or ously ▁opposed ▁by ▁Mid western ▁Representatives ▁and ▁the ▁bill ▁died ▁in ▁the ▁agricult ure ▁committee . ▁Und eter red , ▁R ivers ▁re int rodu ced ▁the ▁bill ▁every ▁year ▁and ▁made ▁so ▁many ▁speech es ▁in ▁favor ▁of ▁the ▁repe al ▁of ▁the ▁tax ▁that ▁he ▁was ▁nick named ▁" O le o " ▁R ivers . ▁In ▁ 1 9 4 9 , ▁he ▁circul ated ▁a ▁pet ition ▁in ▁the ▁House ▁to ▁force ▁the ▁bill ▁out ▁of ▁the ▁agricult ure ▁committee ▁and ▁to ▁the ▁full ▁House ▁for ▁a ▁vote . ▁The ▁bill ▁passed ▁the ▁House ▁and ▁then ▁the ▁Senate ▁and ▁was ▁signed ▁into ▁law ▁by ▁President ▁Tr uman ▁in ▁ 1 9 5 0 . ▁The ▁manufact ur ers ▁of ▁marg ar ine ▁were ▁forever ▁grateful ▁to ▁R ivers ▁and ▁sent ▁him ▁compl iment ary ▁boxes ▁of ▁o le o ▁until ▁the ▁day ▁he ▁died . ▁ ▁View s ▁regarding