No agreement, combination or contract by or between two or more persons to do or procure to be done, or not to do or procure not to be done, any act in contemplation or furtherance of any trade dispute between employers and employees, shall be deemed criminal, nor shall those engaged therein be indictable or otherwise punishable for the crime of conspiracy, if such act committed by one person would not be punishable as a crime, nor shall such agreement, combination or contract be considered as in restraint of trade or commerce, nor shall any restraining order or injunction be issued with relation thereto. Nothing in this article,¹ shall exempt from punishment otherwise than is herein excepted, any person guilty of conspiracy for which punishment is provided by any other law of the state, but such other law shall, as to the agreement, combination and contracts heretofore referred to, be construed as if this article, was therein contained: Provided, that nothing in this article, shall be construed to authorize force or violence.