It was that year Mr. Karger decided to make famous every significant donor to the $40.5 million effort to pass Proposition 8. His group, Californians Against Hate, mined disclosure reports and listed everyone who contributed $5,000 or more to pro-Prop 8 committees on a “dishonor roll” website, with phone numbers and business addresses. Other activists made the data searchable via Google Maps, and he pitched out-of-state newspapers to cover local megadonors to the pro-Prop 8 group Protect Marriage. He picketed upscale supermarkets in New York City and Washington, D.C., to discourage shoppers from buying smoothies and dressings from Bolthouse Farms, whose eponymous founder put $100,000 behind the referendum. After Proposition 8 passed, Mr. Karger led a two-week boycott of the Utah-based Ken Garff Automotive Group, which had 53 dealerships across three states, because one of Mr. Garff’s relatives had given $100,000 to pass Proposition 8. “Individuals and businesses gave a vast amount of money to take away our equality, and we want you to know who they are,” Mr. Karger wrote.