No employer shall advertise seeking to hire employees to replace employees on strike or locked out during any period when a strike or lockout is in progress, which strike or lockout has arisen out of a dispute between the management of the business and persons employed by such management at the time of such dispute who strike or are locked out as the result of failure in settling such dispute, unless it shall be stated in such advertisement that a strike or lockout is in progress at such place of business.