California, United States of America
The following excerpt is from Nguyen v. Inter-Coast Int'l Training, Inc., B270305 (Cal. App. 2018):
7. The key difference between collective actions and class actions is that the former require additional plaintiffs to affirmatively opt in to the suit, while the latter sweep in all putative class members unless they affirmatively opt out. (Haro v. City of Rosemead (2009) 174 Cal.App.4th 1067, 1072.)
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