In Irving Air Chute Co. v. N.L.R.B., 2 Cir., 350 F.2d 176, 182, the Court in allowing enforcement of the Board's order cited many cases for the proposition, "`It is for the Board not the courts to determine how the effect of prior unfair labor practices may be expunged'."
Holding that a supervisor's statement to employee that he knew employee's co-workers were union members created impression that company was engaged in surveillance, exacerbated the coercive effect of the interrogation, and constituted an independent violation of ยง 8