Define “space junk” and how does this agency have authority to do so.
There are thousands of dead satellites and dead boosters and pieces of same, floating around without power and/or without useful attitude or position control. They are acknowledged to be derelict, and they present a serious and growing danger to other viable craft. There are registries of "space junk", along with the registries of viable spacecraft, including both commercial and governmental, and yes, even the ones whose mission is classified.
While it's physically possible for something like the Claw to make a mistake (or a "mistake") and snatch a live satellite, that would create an international uproar.