Earl Warren,
Mitsugi Nishikawa v. Dulles — Opinion of the Court
“ When the Government contends that the basic right of citizenship has been lost, it assumes an onerous burden of proof. Regardless of what conduct is alleged to result in expatriation, whenever the issue of voluntariness is put in issue, the Government must in each case prove voluntary conduct by clear, convincing and unequivocal evidence. ”
