violator

/V AY1 AH0 L EY0 T ER0/
noun
  1. 1

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

  2. 2

    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.

Source: https://en.wiktionary.org/wiki/violator