William R. Day,
Cameron v. United States (231 U.S. 710…
“ The government contends that the subsequent repeal of this section deprives the petitioner of the immunity afforded. We cannot agree with this contention. It would be subversive of principles of right and justice to give such effect to a statute upon the protection of which the petitioner had the right to rely at the time when called upon to testify in the bankruptcy court, and in consequence of which he may be presumed to have given his testimony. A retrospective operation of statutes is not to be given except in clear cases, unequivocally evidencing the legislative intent to that effect. ”
