"Amazon brags it pays workers above the minimum wage. What they don't tell you is what those jobs are really like. And they certainly don't tell you what they can afford."
"Where will your dues go?" read a sign placed on the back of stall door, The Washington Post reported.
The investors calling for Amazon to cease pushing back on the unionization efforts collectively hold more than $20 billion worth of the company's shares.
Businesses often oppose unions because they can interfere with their autonomy or affect them economically.