Nearly 400 people who say they are "a person of wealth" signed an open letter calling for global leaders to increase taxes on the superrich. Signatories of the letter, which was addressed to leaders at the World Economic Forum's Davos conference this week, include actor Mark Ruffalo, film producer and activist Abigail Disney, and musician Brian Eno. The letter said that a few ultrawealthy people are negatively influencing nearly every aspect of society. "A handful of global oligarchs with