This sort of "abduction" is wholly legal. Likely the execution of arrest warrants approved by judges.
Don't get yer britches all wadded up here folks.
Just to bring another angle in on this (or at least a similar MO) there have been many many assertions of how "no knock" warrants for arrest should be handled outside the home at more vulnerable times. I'm not sure exactly what any given person thinks that would look like but unmarked vehicles (if they see you and start running it's just a different kind of mess) and ambush takedown seem like the most natural alternative to the NK.
Anyway, just a thought, even if that's not what happened here specifically.