Earlier quoted context omitted.
Depending on the jurisdiction, severance packages may be required for mass layoffs.
The WARN act (US federal law) requires that any company with over 100 employees gives 60 days notice. If they don't provide 60 days notice, they are required to give 60 days pay. Obviously, local laws will vary greatly.
Pay and compensation for the value of employee-provided benefits to which they would have been entitled had they been employed, if the layoff meets the size, etc., requirement for WARN Act coverage.