There’s a message being sent by this “tactical gear” and it says that these Marshals think they’re a military detachment and everyone around them not clearly labeled as law enforcement is the “enemy” — including anyone with a camera.
Now, it’s pretty well established that citizens have the right to film law enforcement officers while in public places. There are exceptions, of course, but none of those appear to be in play here.
What does appear to be in play is the mental exception far too many law enforcement officers feel they can deploy whenever they’d rather not be “watched.” According to an interview with Beatriz Paez, whose filming was “interrupted” by the US Marshal (and fortunately filmed by yet another person from across the street), the officers first turned their backs to her (which is fine) and then proceeded to keep moving towards her to block off her view.
When this more subtle intimidation failed to deter Paez, the US Marshal simply stormed up to her, grabbed her phone, smashed it to the ground and finally, kicked the shattered device back to her.
I guess she can be thankful he didn’t demand she hand over the phone as evidence. Although, if he had deployed that BS tactic, he’d just look stupid rather than abusive and potentially dangerous — a person armed to the teeth who can’t control his impulses.