Wis. Stat. § 967.05: Methods of prosecution.

(1) A prosecution may be commenced by the filing of:

(a) A complaint;

(b) In the case of a corporation or limited liability company, an information;

(c) An indictment.

(2) The trial of a misdemeanor action shall be upon a complaint.

(3) The trial of a felony action shall be upon an information.