Under the Norris-LaGuardia Act of 1932, courts were explicitly prohibited from interfering with peaceful union activities, yellow dog contracts became unenforceable, and the conspiracy doctrine was effectively overturned.

Norris-LaGuardia Act

A 1932 U.S. federal law that restricted the power of courts to issue injunctions against non-violent labor disputes and marked a significant step in promoting labor rights.

Peaceful Union Activities

Actions taken by labor unions, such as strikes or protests, conducted lawfully and without violence to advocate for workers' rights and interests.