"Full union membership thus no longer can be a requirement of employment. If a new employee refuses formally to join a union and subject himself to its discipli

"Full union membership thus no longer can be a requirement of employment. If a new employee refuses formally to join a union and subject himself to its discipline, he cannot be fired. Moreover, no employee can be discharged if he initially joins a union, and subsequently resigns."[1] [1] https://caselaw.findlaw.com/us-supreme-court/473/95.html https://caselaw.findlaw.com/us-supreme-court/473/95.html