Pennsylvania Statutes Title 53 P.S. Municipal and Quasi-Municipal Corporations § 22332. Complaint;  rule to appear and answer

Complaint in writing may be made to the court of common pleas of the proper county, by not less than twenty freeholders of the city, each of whom shall write his occupation and residence opposite his signature, charging any municipal officer with any offense, setting forth the facts on which the said charge is founded, supported by the oaths or affirmations of at least five of the complainants, according to the best of their knowledge, information and belief.  If, in the judgment of the court, there appears to be reasonable ground for such proceeding, the court shall direct the complaint to be filed of record, and grant a rule upon the accused, returnable on a day certain, to appear and answer the same.