In Neptune Water Meter Co. v. NLRB, 551 F.2d 568 (4th Cir. 1977) the Court of Appeals held that while discriminatory motivation need only be a factor in the discharge of an employee for the NLRB to find an unfair labor practice, "an unfair labor practice may be found only if there is a basis in the record for a finding that the employee would not have been discharged..except for the fact of his union activity."