the action you need is every laid-off employee file arbitration and each case of arbitration costs Stellantis $3500, even before a chance of determination.
and 500*$3500, 1.75 million US$. Oh well, let's do it then. Even if it doesn't come to anything, let's hurt the employer as much as we can, legally.
Arbitration paper is attached here, (EDRP process)
https://drive.google.com/file/d/1VV83LLWNGtXJWKMIJVYgA6uZuBQB_Mtn/view?usp=sharing
https://drive.google.com/file/d/1KckJovV7gfA5sl36vi8WS-JRj8X18pEo/view?usp=drive_link
Best of luck!