In the case of Medo Photo Supply Corp. v. National Labor Relations Board (1943), the U.S Supreme Court upheld a decision by the National Labor Relations Board that found Medo Photo Supply Corporation guilty of unfair labor practices under Section 8(1) and (3) of the National Labor Relations Act. The corporation had dismissed employees who were members of a union, which was considered an act to discourage membership in any labor organization - violating their rights to self-organization and collective bargaining as protected by Section 7 of the Act. The court ruled that reinstatement with back pay for these workers was appropriate, rejecting arguments from Medo Photo Supply Corp that such action would be punitive rather than remedial due to financial hardship it might cause them.

The dissenting opinion in the case of Medo Photo Supply Corp. v. National Labor Relations Board argued that the majority's decision was an overreach and misinterpretation of the National Labor Relations Act (NLRA). The dissent contended that while it is true that employers should not interfere with employees' rights to organize, this does not mean they are obligated to negotiate with a union if there is reasonable doubt about its representative status. In this case, there were legitimate concerns raised by other employees about whether or not the union truly represented their interests. Therefore, according to the dissenters, it was unjust for the court to penalize Medo Photo Supply Corp for refusing to bargain under these circumstances as it did not violate any provision of NLRA but rather exercised caution in ensuring fair representation for all its workers.