In Abatti Farms, Inc. v. Agricultural Labor Relations Bd. (1980) 107 Cal.App.3d 317, the Court upheld a board finding that layoff and refusal to rehire workers under like circumstances constituted an unfair labor practice, stating: "We conclude the Board findings of impermissible discharge or refusal to rehire are entitled to enforcement. The evidence of wrongful motive is circumstantial, but sufficient. We may not substitute our judgment for that of the Board in its area of special expertise, the assessment of the weight of circumstantial evidence in context." ( Abatti Farms, Inc. v. Agricultural Labor Relations Bd., supra, 107 Cal.App.3d 317, 333.)