The Oklahoma National Guard and the California Highway Patrol served as 'muscle' for the unconstitutional confiscation of firearms from high-and-dry, law-abiding citizens of New Orleans.

The use of 'out-of-towners' to enforce illegal or unpopular actions is a worldwide tactic. There's even a nice-sounding "justification": It 'prevents favoritism' and 'assures even-handed treatment'.

In other words it makes it easy on the trigger-pullers.