Wis. Stat. § 946.47: Harboring or aiding felons.

(1) Whoever does either of the following may be penalized as provided in sub. (2m):

(a) With intent to prevent the apprehension of a felon, harbors or aids him or her; or

(b) With intent to prevent the apprehension, prosecution or conviction of a felon, destroys, alters, hides, or disguises physical evidence or places false evidence.

(2) As used in this section “felon” means either of the following:

(a) A person who commits an act within the jurisdiction of this state which constitutes a felony under the law of this state; or

(b) A person who commits an act within the jurisdiction of another state which is punishable by imprisonment for one year or more in a state prison or penitentiary under the law of that state and would, if committed in this state, constitute a felony under the law of this state.

(2m) Whoever violates sub. (1) is guilty of the following:

(a) A Class G felony, if the offense committed by the felon being aided is, or would have been if the offense had been committed in this state, any of the following:

1. A Class A, B, C, or D felony.

2. An unclassified felony that is punishable by a sentence of life imprisonment.

(b) A Class I felony, if the offense committed by the felon being aided is, or would have been if the offense had been committed in this state, any of the following:

1. A Class E, F, G, H, or I felony.

2. An unclassified felony that is not punishable by a sentence of life imprisonment.