US labour officials have found that Amazon retaliated illegally when it fired two employees who had spoke out about the firm’s environmental practices and warehouse safety. The National Labor Relations Board was investigating a complaint brought by Emily Cunningham and Maren Costa, who had helped organise the group Amazon Employees for Climate Justice. They were fired last April. Amazon said it disagreed with the finding. “We support every employee’s right to criticise their employer’s working conditions, but that does not come with blanket immunity against our internal policies, all of which are lawful,” an Amazon spokesman said on Monday. “We terminated these employees not for talking publicly about working conditions, safety, or sustainability, but rather, for repeatedly violating internal policies.” The National Labour Relations Board (NLRB) will file its own complaint if the firm does not settle the case. “It’s a moral victory and really shows that we are on the right side of history and the right side of the law,” Ms Cunningham told the New York Times, which first reported the conclusions of the NLRB’s investigation of the incident.