Let's say I have a company with an R&D budget of $1 billion. $100 million goes into robotics and AI, $900 million goes into core business interests. You form a union and demand all kinds of ridiculous accommodations that you could never have reasonably asked for on your own.
What will happen when budgeting for the next fiscal year? Replacing you is a core business interest now, and so is avoiding the need to hire your replacement. The R&D budget will be adjusted accordingly.
If you want "leverage," the best way to achieve that is to make yourself more valuable, not less.