65 Pa. Stat. § 214
Every appointing authority shall establish, by rules, regulations, or otherwise, procedures designed to ascertain, before any person, including teachers and other employes of the public school system, is appointed or employed, that he is not a subversive person. In the event the applicant is deemed to be a subversive person, he shall not be appointed or employed. In addition, each applicant shall be required to make a written statement, under oath or affirmation, which statement shall contain notice that it is subject to the penalties of perjury, and shall be in the following form:
"I, ........................, do solemnly swear (or affirm) that I will support, obey and defend the Constitution of the United States and the Constitution of this Commonwealth, and that I will discharge the duties of ........................ with fidelity.
"And I do further swear (or affirm) that I am not knowingly a member with the specific intent to further the aims of any organization that advocates, the overthrow of the government of the United States or of this Commonwealth by force or violence or other unconstitutional means, or seeking by force or violence to deny other persons their rights under the Constitution of the United States or of this Commonwealth.
"And I do further swear (or affirm) that I will not knowingly become a member with the specific intent to further the aims of such organization during the period that I am an employe of the Commonwealth of Pennsylvania (or political subdivision thereof)."
65 P.S. § 214