So long as the minions that keep posting above abuse you for taking a stance (and, exhibit their essential ignorance of negotiating strategies), corporations will keep using current employees "at will," and then abuse them, "at will." You have taken a bold stance, and while I doubt you'll completely succeed, you may be the "Rosa Parks" of employee rights.
Salaries need to be negotiated, and if you possess unique skills that are of value to the employer, they should be compensated equitably. While I am retired, I can tell you that as a self-employed consultant for over three decades, my ultimate income was over $1,000/day (in 1990's) because of the VALUE I delivered. If the corporation wanted that value, they expected to pay for the price. But, the return they got was, for example, with one large chemical company, over $400 Million in the first year.
What US employees have to do is to show their employers (or clients) how much VALUE they create...when you do that, each client is happy to share their success with other potential clients looking for similar value. So long as you "occupy a chair" for a modest salary, you have no-doubt signed an "at will" employment clause that grants the employer all the rights in your relationship.
Matthew Culver: You are challenging that perverse relationship, and I applaud the attempt. As Inequality.org points out, "...the 1 percent has 35.6 percent of all private wealth, more than the bottom 95 percent combined." And sacking the people that actually CREATED that value, because labor costs can be reduced, producing more margin for the 1% to harvest, is one of the ways they do it. And, even it you don't win, you can be proud of initiating a movement of other employees engaging attorneys seeking out such cases with ever-evolving innovative arguments. And, if that process fails, we all may as well admit we've reintroduced slavery back into Western cultures.