Chevron has attempted to avoid millions of dollars' worth of taxes plus 18 years' worth of unethical business practices. When they dumped billions of gallons worth of toxic waste into Ecuadorian rainforest, they were sued and tried to deny their involvement even though there was plenty of solid evidence. They even faked a letter from Ecuador's ambassador that claimed to dismiss the lawsuit and worked to discredit the judge, delaying the suit for two years.