▁States ." ▁ ▁Through ▁the ▁central ization ▁of ▁all ▁natural ization ▁and ▁imm igration ▁records ▁the ▁Federal ▁Government ▁was ▁able ▁to ▁command ▁more ▁control ▁over ▁the ▁natural ization ▁process . ▁The ▁central ization ▁mand ate ▁produced ▁a ▁uniform ▁process ▁as ▁well ▁as ▁causing ▁the ▁number ▁of ▁courts ▁processing ▁applications ▁to ▁fall ▁throughout ▁the ▁country ." ▁This ▁central ization ▁also ▁included ▁the ▁dispers al ▁of ▁standard ▁natural ization ▁documents ▁following ▁the ▁law ' s ▁en act ment . ▁On ▁September ▁ 2 7 th ▁of ▁ 1 9 0 6 , ▁the ▁United ▁States ▁Federal ▁Natural ization ▁Bureau ▁began ▁keeping ▁copies ▁of ▁all ▁American ▁natural ization ▁records . 8 ▁The ▁natural ization ▁certificate ▁files ▁would ▁come ▁to ▁be ▁known ▁as ▁C - Files . ▁Additionally , ▁those ▁who ▁had ▁acquired ▁their ▁citizens hip ▁on ▁question able ▁legal ▁grounds , ▁are ▁now ▁subject ▁to ▁additional ▁scr ut iny , ▁as ▁a ▁direct ▁result ▁of ▁this ▁law . ▁Section ▁ 1 5 ▁clearly ▁out lines ▁the ▁powers ▁granted ▁to ▁U . S . ▁att or ne ys ▁towards ▁pro sec uting ▁these ▁cases , ▁with ▁language ▁giving ▁a ▁considerable ▁amount ▁of ▁the ▁bur den ▁of ▁proof ▁to ▁defend ants . ▁This ▁provision ▁was ▁quite ▁en comp ass ing , ▁thus ▁prom oting ▁a ▁number ▁of ▁pro sec utions ▁on ▁the ▁basis ▁of ▁fra ud ul ent ▁natural ization ▁procedures . ▁The ▁case ▁of ▁L uria ▁vs . ▁United ▁States ▁challeng es ▁this ▁provision , ▁but ▁it ▁is ▁de emed ▁constitution al . ▁ ▁Part icular ly