It shall be unlawful and against public policy for any person to engage in, or to induce or encourage the employees of any employer to engage in a strike or a concerted refusal in the course of their employment to use, manufacture, process, transport, or otherwise handle or work on any goods, articles, materials, or commodities or to perform any services, where an object thereof is:
Provided, That nothing in this section shall be construed to prevent an individual from quitting his employment at any time: Provided further, That nothing contained in this section shall be construed to make unlawful a refusal by any person to enter upon the premises of any employer (other than his own employer), if the employees of such employer are engaged in a strike ratified or approved by a representative of a collective bargaining unit which such employer is required to recognize under this act: Provided further, That nothing in this section shall prohibit the extension of picketing or other legitimate labor union activity to the plant or premises of another employer if the employer with whom a labor union is engaged in a direct legitimate dispute shall subcontract to such other employer any portion of his production in an attempt to avoid the consequences of labor activity in such dispute.
K.S.A. 44-809a