s, Inc., 322 NLRB 695, 703, 707 (1996) (threats, interrogations, creation of impression of surveillance, evidence of unlawfully motivated discharge); Champion Rivet Co., 314 NLRB 1097, 1098 (1994) (circulating unlawful antiunion petition, 160 See, e.g., comments of COLLE and California Chamber. 161 See comment of