A U.S. judge has rejected efforts by Chevron Corp to secure documents from a California environmental advocacy group in a fraud case related to a $19 billion award for rainforest pollution in Ecuador. Magistrate Judge Nathanael Cousins…quashed Chevron's subpoena for a deposition and documents from Amazon Watch…The subpoena was related to a case scheduled to go to trial on October 15 in which Chevron accuses Ecuadorean residents, their lawyers and advisers of fraud in obtaining a multi-billion dollar judgment from a local court. Cousins said he had to weigh the free speech rights of Amazon Watch under the U.S. Constitution's First Amendment against the possibility of Chevron uncovering evidence for its case…