3 Pa. Stat. § 1
The board of managers or executive committee, of any agricultural or horticultural society of this state, is hereby authorized to appoint as many citizens of this state, policemen, as shall be necessary for their exhibitions, whose duty it shall be to preserve order within and around the grounds of said society; protect their property within said grounds; to eject all persons who shall be improperly within the grounds of said society, or who shall be guilty of disorderly conduct, or who shall neglect or refuse to pay the fee or observe the rules prescribed by said society; said policemen shall have the same power the time said exhibition shall continue, that a constable may have by law, in serving criminal process and making arrests, and in addition, may arrest any person for the commission of any offence, mentioned in section two.
3 P.S. § 1