It shall be unlawful for any group of employes acting in concert to call a strike, or to go out on strike, or to cause any work stoppage or slowdown in violation of the provisions of this act. It shall be unlawful for any employer to lockout his employe in violation of the provisions of this act. It shall be unlawful for any person, association or corporation to instigate, induce, conspire with or encourage any person or persons to engage in any strike, lockout, slowdown or work stoppage in violation of the provisions of this act. Any violation of the provisions of this act shall constitute a misdemeanor, and upon conviction thereof, the person, association or corporation shall be sentenced to pay a fine of not less than five hundred ($500) dollars or more than twenty-five hundred ($2,500) dollars, or suffer imprisonment for not more than six months, or both. In the case of violation by associations and corporations, the penalty by imprisonment may be imposed upon the representatives or officers thereof responsible for such violation.