Can a repo company move another persons car to get to my car in the state of pennsylvania?

No. The only car they can touch is the one they are going after. Nor can they get inside a closed garage.

The first answer is correct so far as it goes.

In no state that I know of can a "repossession agent" disturb the peace or commit a felony, misdemeanor or offense during the course of a repossession of property.