Twenty-nine Nobel laureates have condemned alleged "judicial harassment" by Chevron and urged the release of a US environmental lawyer who was put under house arrest for pursuing oil-spill compensation claims on behalf of indigenous tribes in the Amazon. The open letter signed by scientists, authors, environmentalists and human rights activists said the treatment of lawyer Steven Donziger, whose movements have been restricted for more than 250 days, was one of the world's most egregious cases of judicial harassment and defamation. Donziger represents 30,000 indigenous people and small farmers who won a $9.5bn class action lawsuit against Chevron in Ecuadorean courts in 2013, as compensation for the contamination of their land by oil extraction activities. This judgment was one of the largest ever against an oil company, but not a cent of these damages has been paid to the plaintiffs. Donziger, who has been involved with the case for 27 years, has pressed for justice and payment of damages to his clients at increasing personal cost. His reputation, legal credentials and liberty have come under attack. Chevron has lobbied for his removal from bar associations and launched a countersuit accusing him of bribery and fraud, which was upheld by district judge Lewis A Kaplan in 2014. It was later reported that Chevron paid more than a million dollars for one of the key witnesses in the case " an Ecuadorean judge " to come to the United States. That witness later said he lied under oath.