Early Monday morning, thousands of protesters joined forces at an intersection near Bangkok's commercial center to protest the proposed amnesty for Thaksin Shinawatra, who was ousted as prime minister in a 2006 military coup that set off years of instability in Thailand. Mr. Thaksin, a 64-year-old telecom tycoon who ran Thailand for five years, has been living in self-imposed exile, evading imprisonment on a corruption conviction that he says was politically motivated.