The U.S. Supreme Court case International Brotherhood of Teamsters, Etc. Union, Local 309, et al. v. Hanke et al., doing business as Atlas Auto Rebuild in 1949 revolved around the issue of labor union picketing and its constitutionality under the First Amendment's protection of free speech rights versus state laws prohibiting such activities for their potential to incite violence or harm businesses economically. In this case, a local branch of the International Brotherhood of Teamsters was accused by Atlas Auto Rebuild (a car repair shop) in Washington State for illegal picketing that allegedly caused economic damage to their business operations due to lost customers who were deterred by the presence and actions of striking workers outside their premises. The court ruled against the union stating that states have a legitimate interest in preventing potentially harmful conduct associated with labor disputes including violent confrontations between strikers and non-striking employees or customers which could disrupt public order or cause significant economic harm to businesses targeted by strikes. This ruling upheld Washington State’s law restricting certain types of aggressive picketing tactics used during labor disputes while also affirming that not all forms of peaceful protest activity are automatically protected under First Amendment free speech rights if they pose substantial risks to public safety or private property interests.

The dissenting opinion in the case of International Brotherhood of Teamsters, Etc. Union, Local 309, et al. v. Hanke et al., doing business as Atlas Auto Rebuild argued that the majority's decision to uphold an injunction against a labor union for picketing was incorrect and potentially harmful to workers' rights. The dissenters believed that peaceful picketing should be protected under the First Amendment right to free speech and assembly, even if it is intended to persuade customers not to patronize a particular business due to labor disputes. They also disagreed with the majority's interpretation of Washington state law regarding secondary boycotts; they felt this interpretation was overly broad and could unfairly restrict unions' abilities to advocate for their members' interests through lawful means such as picketing or other forms of protest.