Here, where the pure Scots broom (Cytisus scoparius) is a weed it would not be kosher to harbor it. However, there may be no problem with it infesting large areas in PA. And the plant shown is probably instead one of the named garden hybrid brooms currently on the market, anyway.
If you found it along a path in the woods or in an established garden, it is likely the invasive variant of this plant. There are many native plant enthusiasts who dismiss the sale of new hybrids as causing confusion.
