▁it ▁to ▁remove ▁non - cit iz ens ▁from ▁the ▁elect oral ▁list . ▁Following ▁that , ▁an ▁int ensive ▁revision ▁of ▁elect oral ▁roll s ▁began ▁in ▁Ass am , ▁involving ▁door ▁to ▁door ▁survey ▁in ▁order ▁to ▁en list ▁only ▁genu ine ▁Indian ▁citizens . ▁The ▁persons ▁who ▁could ▁not ▁provide ▁evidence ▁in ▁favour ▁of ▁their ▁Indian ▁national ity ▁were ▁marked ▁with ▁D ▁in ▁the ▁elect oral ▁roll s , ▁to ▁indicated ▁doubt ful ▁or ▁disput ed ▁status ▁of ▁their ▁Indian ▁national ity . ▁During ▁the ▁survey , ▁the ▁abs ente e ▁vot ers ▁too ▁were ▁marked ▁with ▁D . ▁Ar ound ▁ 3 7 0 , 0 0 0 ▁persons ▁were ▁thus ▁declared ▁as ▁D ▁vot ers ▁by ▁the ▁E lection ▁Commission ▁of ▁India . ▁The ▁persons ▁marked ▁as ▁D ▁vot ers ▁were ▁bar red ▁from ▁contest ing ▁the ▁elections ▁and ▁casting ▁their ▁votes . ▁The ▁E lection ▁Commission ▁of ▁India ▁further ▁directed ▁the ▁D ▁vot ers ▁to ▁be ▁put ▁on ▁trial ▁before ▁the ▁Foreign ers ▁Trib un als ▁set ▁up ▁under ▁the ▁Foreign er ▁( T rib unal ) ▁Order ▁of ▁ 1 9 6 4 . ▁Out ▁of ▁an ▁estimated ▁ 3 7 0 , 0 0 0 , ▁only ▁ 1 9 9 , 6 3 1 ▁cases ▁were ▁referred ▁to ▁the ▁trib un als ▁for ▁ver ification . ▁During ▁the ▁initial ▁tri als ▁ 3 , 6 8 6 ▁persons ▁were ▁found ▁to ▁be ▁foreign ers , ▁who ▁names ▁were ▁removed ▁from ▁the ▁elect oral ▁roll