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Yes, it's the WARN act:

https://en.wikipedia.org/wiki/Worker_Adjustment_and_Retraini...

California also has their own version: https://www.shrm.org/resourcesandtools/tools-and-samples/hr-...

Per Chapter 4, Part 4, Sections 1400-1408 of the Labor Code, WARN protects employees, their families, and communities by requiring that employers give a 60-day notice to the affected employees and both state and local representatives prior to a plant closing or mass layoff.

http://www.edd.ca.gov/Jobs_and_Training/Layoff_Services_WARN...

For qualifying situations

https://en.m.wikipedia.org/wiki/Worker_Adjustment_and_Retrai...

Yes. By law, they have to report it, esp in CA