In Republic Aviation Corp. v. NLRB, 324 U.S. 793, (1945), the Court upheld the Board's ruling that an employer may not prohibit its employees from distributing union organizational literature in nonworking areas of its industrial property during nonworking time, absent a showing by the employer that a ban is necessary to maintain plant discipline or production. This ruling obtained even though the employees had not shown that distribution off the employer's property would be ineffective. 324 U.S., at 798-799, 801. In the Court's view, the Board had reached an acceptable "adjustment between the undisputed right of self-organization assured to employees under the Wagner Act and the equally undisputed right of employers to maintain discipline in their establishments." Id., at 797-798.