red card

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A red-colored card shown by a referee to a player, especially in soccer, to indicate that the player is being ejected from the game.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun sports A card displayed by the referee when a player is sent off for a serious infringement of the rules.
• noun colloquial Any official instructions to vacate an area.