Sections 227(a) and 260 of Pub. L. 91–452 provided for repeal of this section effective four years following sixtieth day after date of enactment of Pub. L. 91–452, which was approved Oct. 15, 1970, such repeal not affecting any immunity to which any individual was entitled under this section by reason of any testimony or other information given before such date. See section 260 of Pub. L. 91–452, set out as an Effective Date; Savings Provision note under section 6001 of this title.