Section 11. Whoever falsely makes or wilfully alters, defaces, mutilates, destroys or suppresses a certificate of nomination or nomination paper, or letter of withdrawal of a name from such paper, or an initiative petition or a petition for the submission of a question to the voters, or unlawfully signs any such certificate, paper, letter or petition, or files any such certificate, paper, letter or petition, knowing the same to be falsely made or altered, shall be punished by a fine of not more than one thousand dollars or by imprisonment for not more than one year.