By inserting individual arbitration clauses into a soaring number of consumer and employment contracts, companies like American Express devised a way to circumvent the courts and bar people from joining together in class-action lawsuits, realistically the only tool citizens have to fight illegal or deceitful business practices.

Over the last few years, it has become increasingly difficult to apply for a credit card, use a cellphone, get cable or Internet service, or shop online without agreeing to private arbitration. The same applies to getting a job, renting a car or placing a relative in a nursing home.