Pub. L. 88-643, tit. II, pt. H, sec. 273
reemployment compensation
reemployment compensation Sec. 273. (a) Notwithstanding any other provision of law, any annuitant who has retired under this Act and who is reemployed in the Federal Government service in any appointive position either on a part-time or full-time basis shall be entitled to receive his annuity payable under this Act, but there shall be deducted from his salary a sum equal to the annuity allocable to the period of actual employment. (b) In the event of any overpayment under this section, such over-payment shall be recovered by withholding the amount involved from the salary payable to such reemployed annuitant, or from any other moneys, including his annuity, payable in accordance with the provisions of this Act.