If They Went To Prision...

[The Squatter of Amon Rûdh]

Here's a few to keep you going:

Everyone, at some time or another: possession of an offensive weapon with intent to cause grievous bodily harm.

Aragorn: Incitement to riot; conduct likely to cause a breach of the peace; assault with a deadly weapon; actual bodily harm; grievous bodily harm; armed robbery (he stole his fleet from the Corsairs of Umbar, and he was armed at the time; this could also be interpreted as an act of piracy)

Gandalf: vagrancy (think about it: there's no evidence that he carried any money and he was of no fixed abode. Come to think of it, he was also a wild-haired, bearded old man who often said odd and disturbing things to people)

Sam: Aggravated assault;
as an accomplice of F. Baggins, esq. kidnap (of one Sméagol, vagrant)