Obnoxiousness is a universal human trait. But for unions, it’s a tool of persuasion. Large employers, with good reason, are wary. A new paper from the U.S. Chamber of Commerce, “Hardball: The Tactics of Union Corporate Campaigns,” summarizes organized labor’s frequently aggressive, predatory shakedown tactics in the search to win concessions from supposedly morally errant employers. These campaigns, which seek to discredit a targeted firm’s brand name in hopes of winning concessions, involve extensive groundwork; these campaigns can last for years. Unions and their allies test the legal limits of protest, while raising the costs of business. Undeterred by reality, certain lawmakers on Capitol Hill, led by Sens. Bernie Sanders, I-Vt., and Patty Murray, D-Wash., are sponsoring bills to repeal safeguards against such behavior.