71 Pa. Stat. § 1442
The Industrial Board shall have the power to make investigations concerning, and report upon, all matters touching the enforcement and effect of the provisions of all laws of the Commonwealth, the enforcement of which shall now and hereafter be imposed upon the Department of Labor and Industry, and the rules and regulations made by the Industrial Board in connection therewith; and to subpoena and require the attendance in this Commonwealth of all witnesses, and the production of books and papers pertinent to the said investigation, and to examine them and such public records as it may require in relation to any matter which it has power to investigate. Any witness who refuses to obey a subpoena of the said board, as hereinabove provided for, or who refuses to be sworn or to testify, or who fails or refuses to produce any books, papers, or documents touching any matter under investigation or examination by the said board, or who is guilty of any contempt after being summoned to appear before the said board as above provided, may be punished as for contempt of court; and, for this purpose, application may be made to any court within whose territorial jurisdiction the said contempt took place, and for which purpose the courts of the common pleas of this Commonwealth are hereby given jurisdiction. In the course of such investigation each member of said board shall have power to administer oaths. Each member shall have the further power to make personal investigations of all establishments in this Commonwealth where labor is employed.
71 P.S. § 1442