Wis. Stat. § 216.03: Penalty.

Any person, partnership, association or corporation who or which shall act as principal or agent in doing such business or in soliciting business for, or membership or participation in, any such partnership, association or corporation, or solicit business for such person or persons doing business as such companies, not authorized to do business in this state, shall be deemed guilty of a misdemeanor and upon conviction thereof shall be fined not less than $100 nor more than $1,000 or imprisoned in the county jail for not less than 3 months nor more than one year or both.