53 Pa. Stat. § 23457
No question in any form of application or in any examination shall be so framed as to elicit information concerning the political or religious opinions or affiliations of any applicant; nor shall any inquiry be made concerning such opinions or affiliations; and all disclosures thereof shall be discountenanced. No discrimination shall be exercised, threatened, or promised by any person in the civil service against, or in favor of, an applicant, eligible, or employé in the classified service, because of his political or religious opinions or affiliations. No person shall appoint, promote, discharge, remove, reduce, or discriminate in any way against, any officer, clerk, or employé in the competitive, non-competitive or labor classes in the classified civil service of any city of the second class, because he has made or given, or because he has refused or neglected to make or give, any contribution, whether voluntary or involuntary, assessment or payment, for any campaign or political purpose, or for the benefit or promotion of any political party, or for use by any committee or party in connection with any general or primary election.
53 P.S. § 23457