A federal judge in Oklahoma City blocked the National Do Not Call List for telemarketers, ruling that the federal Trade Commission exceeded its authority by establishing the registry. Some 50 million people have signed up for the list, set to take effect October 1. House and Senate lawmakers plan to take up immediate legislation on the matter, and the FTC signaled it will appeal the court ruling. The telemarketing industry vehemently opposes the list, saying it violates free speech.