William O. Douglas,
Schneider v. Rusk (377 U.S. 163…
“ A native-born citizen is free to reside abroad indefinitely without suffering loss of citizenship. The discrimination aimed at naturalized citizens drastically limits their rights to live and work abroad in a way that other citizens may. It creates indeed a second-class citizenship. Living abroad, whether the citizen be naturalized or native born, is no badge of lack of allegiance and in no way evidences a voluntary renunciation of nationality and allegiance. ”
