(1) Whoever, having been released from custody under ch. 969, intentionally fails to comply with the terms of his or her bond is:

(a) If the offense with which the person is charged is a misdemeanor, guilty of a Class A misdemeanor.
(b) If the offense with which the person is charged is a felony, guilty of a Class H felony.

(2) A witness for whom bail has been required under s. 969.01 (3) is guilty of a Class I felony for failure to appear as provided.

http://docs.legis.wisconsin.gov/statutes/statutes/946/IV/49