5 U.S. Code § 3303
5 U.S. Code § 3303 is about Competitive service; recommendations of Senators or Representatives. It is under Part 3 (Employees) Subpart B (Employment and Retention) Subchapter 1 (Examination, Certification, And Appointment) Chapter 33 (Examination, Selection, And Placement) of Title 5 (Government Organizations and Employees) of the Code.
An individual concerned in examining an applicant for or appointing him in the competitive service may not receive or consider a recommendation of the applicant by a Senator or Representative, except as to the character or residence of the applicant.