Protesting, standing outside of a place of business with a sign or other banner in order to provide maximum exposure of the dispute. At times picketers may attempt to prevent people from entering the establishment. by members of a trade union on strike, consists in posting members at all the approaches to the works struck against, for the purpose of observing and reporting the workmen going to or coming from the works, and of using such influence as may be in their power to prevent the workmen from accepting work there.