GF doesn't touch the workforce in Dresden because it's a hard target. The government and Union protect those workers, and if there is a workforce action, the process is very well-defined, expensive, and complicated for GF.
Currently, GF leaders are still determining whether we will survive the purge or not. The feeling of being powerless in this process hurts me the most. A Union would have spelled out the process for us. However, because we don't have a Union, I learned that the National Labor Relations Board protects workers who engage in protected concerted activity even without a Union.
For example, suppose you email your manager and explain how GF can improve working conditions for employees, and you are laid off. In that case, you could argue that you were terminated for protected concerted activity and file a complaint with the National Labor Relations Board.
What is great about this is that you can also sign the severance agreement because you can't sign off on your legal rights meant to protect employees.
At the very least, you give GF a colossal headache to deal with, and if you win, GF will owe you back pay, be on the NLRB watch list, and may have to employ you again.
You don't have to have a union to have NLRB protection, but you do have to make yourself a hard target (like Dresden).
Google: protected concerted activity and the NLRB