In NLRB v. Associated Naval Architects, Inc., 355 F.2d 788, 791 (4th Cir. 1966), the court made clear that evidence of actually coercive statements was not necessary.
In N.L.R.B. v. May Dept. Stores Co., 154 F.2d 533 (8th Cir. 1946), the Court approved the Board's order banning solicitation at all times on the selling floor of the retail store, including during the employees' lunch hour.