violator

noun

1. One who violates (a rule, a boundary, another person's body, etc.); offender

   “The ordinance subjected any violator to a fine, to imprisonment for not more than six months, to community service, or to some combination of the three.”

2. (euphemistic, literary)One who violates (a rule, a boundary, another person's body, etc.); offender
3. In the publishing and packaging industries, a visual element that intentionally "violates" the underlying design, such as a starburst, color bar or "splat" on a product package or magazine cover intended to attract special attention.