I suppose it may very well be the case that the framing of resists giving documents will lead some people to think of it similarly to resisting arrest, but I would have to think those people were idiots.

I think it means they have some documents they don't want to give up. What that means I don't really know, it could mean they have something to hide, but then again it could be they just want to make things difficult for the people they consider their opponents - as I would.