In the case of Local 24, International Brotherhood of Teamsters, Chauffeurs, Warehousemen & Helpers of America, AFL-CIO v. Oliver et al., the U.S Supreme Court ruled in favor of a union's right to enforce "union shop" agreements. These are contracts that require all employees within a bargaining unit to join and maintain membership in the union as a condition for employment. The court held that such agreements were not only permissible under federal labor law but also did not violate an employee’s First Amendment rights by compelling them to associate with unions against their will or beliefs. This decision affirmed that Congress intended these types of arrangements when it passed amendments to the National Labor Relations Act (NLRA) allowing for “agency shop” clauses which required non-union members who benefited from collective bargaining efforts to pay fees equivalent to dues.

In the dissenting opinion for the case of Local 24, International Brotherhood of Teamsters, Chauffeurs, Warehousemen & Helpers of America, AFL-CIO v. Oliver et al., Justice Frankfurter argued that the majority's decision to uphold a lower court ruling against a union's "hot cargo" agreement was incorrect. He believed that such agreements were not inherently illegal under federal labor law and should be evaluated on an individual basis rather than being categorically banned. Furthermore, he contended that Congress did not intend to outlaw these types of agreements when it passed relevant legislation regulating labor practices. Instead, he suggested that lawmakers intended to leave room for negotiation between unions and employers in order to promote industrial peace and stability. Therefore, according to Justice Frankfurter’s view point ,the Court overstepped its bounds by interpreting legislative intent too broadly and imposing its own policy preferences on labor relations.