law: 22.Punishment for threatening witness.-
  Whoever threatens any person who is a witness or any other person in whom such witness may be interested, with violence, or wrongfully restrains or confines the witness, or any other person in whom the witness may be interested, or does any other unlawful act with intent to cause any of the said acts, shall be punishable with imprisonment which may extend to three years, and shall also be liable to fine.