▁interests ▁of ▁national ▁security . ▁Specifically , ▁the ▁right ▁of ▁free ▁association . ▁ ▁The ▁pet ition er , ▁Eug ene ▁Frank ▁Rob el , ▁who ▁worked ▁at ▁Tod d ▁Sh ip y ards ▁in ▁Seattle , ▁was ▁ind icted ▁in ▁May ▁ 2 1 , ▁ 1 9 6 3 ▁for ▁being ▁a ▁member ▁of ▁the ▁Commun ist ▁Party ▁of ▁the ▁United ▁States ▁( CP USA ) ▁and ▁thus ▁affili ated ▁with ▁it , ▁without ▁being ▁registered ▁with ▁the ▁Sub vers ive ▁Activ ities ▁Control ▁Board ▁in ▁viol ation ▁of ▁the ▁Mc Car ran ▁In ternal ▁Security ▁Act ▁section ▁ 5 ▁( a ) ▁( I ) ▁( D ). ▁Since ▁the ▁act ▁required ▁CP USA ▁to ▁register ▁as ▁a ▁Commun ist ▁Party , ▁he ▁was ▁told ▁because ▁of ▁his ▁affili ation ▁with ▁the ▁Party , ▁he ▁also ▁had ▁to ▁register ▁as ▁well , ▁and ▁that ▁he ▁could ▁no ▁longer ▁work ▁at ▁the ▁ship yard ▁because ▁of ▁his ▁affili ation ▁with ▁the ▁Commun ist ▁Party ; ▁Tod d ▁Sh ip y ards ▁had ▁been ▁designated ▁a ▁" def ense " ▁facility , ▁otherwise ▁known ▁as ▁federal ▁employ ment , ▁which ▁was ▁illegal ▁under ▁the ▁Mc Car ran ▁Act . ▁Rob el ▁appe aled ▁his ▁conv iction ▁to ▁the ▁Supreme ▁Court . ▁ ▁The ▁Court ▁found ▁the ▁Mc Car ran ▁In ternal ▁Security ▁Act ▁viol ates ▁the ▁def endant ' s ▁right ▁to ▁free ▁association ▁that ▁is ▁guaranteed ▁by ▁the ▁First ▁Am end ment . ▁ ▁See ▁also ▁ ▁List ▁of ▁United ▁States