Advertising

If any person advertises for, or seeks employees by means of newspapers, posters, letters, radio, television or by means of any employment agency, to work for him or the person for whom he is acting at any shop, plant or establishment, while a strike, lockout, or other labor dispute is still in active progress at such shop, plant or establishment, he shall plainly and explicit mention in such advertisement that a strike, lockout, or other labor dispute exists. The person inserting any such advertisement or by means of any employment agency, shall insert in such advertisement his own name, and, if he is representing another, the name of the person he is representing, and at whose direction, and under whose authority he is inserting the advertisement. The appearance of this name in connection with such advertisement is prima facie evidence as to the person responsible for the advertisement.