Criminal

Criminals or Gray characters are players who have been caught stealing from a npc or player. A player will also turn gray if they assist or heal a Red.

When a player flags gray, they can be freely attacked without being able to call the guards to their aid.

UOStuff

Citizens of Britannia can defend themselves from criminals. Criminal actions include thievery and assault against a blue PC or NPC (including hirelings and pets of blue PCs). Looting a dead body is also considered a criminal action, unless the body belonged to a criminal, murderer or member of an enemy guild.

If you are flagged as a criminal, you highlight gray. Any town guard will kill you on sight, and blue characters can attack you without penalty to Karma. If you loot a body, or launch a non-lethal attack on an innocent, your criminal flag lasts only a few minutes. It would be best to stay out of sight during this time if you do not with to be attacked.