Book excerpt: "As the rise of national corporations began to destroy the local businesses that were the core of his legal practice, Arnold turned from the courtroom to the academy, most notably at Yale Law School, where he became one of the leading spokesmen for the legal realism movement. Arnold's work attracted the attention of Franklin Roosevelt, who appointed him to head the Antitrust Division during the New Deal. He went on to establish Arnold, Fortas & Porter, which became the epitome of the modern Washington, DC law firm, and defended pro-bono hundreds of clients accused of Communist sympathies during the McCarthy era."--BOOK JACKET.