prevailed in every case, including the only case to proceed to trial. In March 2017, an investigation by The New York Times revealed that Uber developed a software tool called "Greyball" to avoid giving rides to known law enforcement officers in areas where its service was illegal such as in Portland, Oregon, Australia, South Korea, and China. The tool identified government officials using geofencing, mining credit card databases, identifying devices, and searches of social media. While at first, Uber stated that it only used the tool to identify riders that violated its terms of service, after investigations by Portland, Oregon, and the United States Department of Justice, Uber admitted to using the tool to skirt local regulations and promised not to use the tool for that purpose. The use of Greyball in London was cited by Transport for London as one of the reasons for its decision not to renew Uber's private hire operator licence in September 2017. A January 2018 report by Bloomberg News stated that Uber routinely used a "panic button" system, codenamed "Ripley", that locked, powered off and changed passwords on staff computers when those offices were subjected to government raids. Uber allegedly used this button at least 24 times, from spring 2015 until late 2016. Counter-intelligence research on class action plaintiffs In 2016 Uber hired the global security consulting firm Ergo to secretly investigate plaintiffs involved in a class action lawsuit. Ergo operatives posed as acquaintances of the plaintiff's counsel and tried to contact their associates to obtain information that could be used against them. The result of which was found out causing the judge to throw out evidence obtained as obtained in a fraudulent manner. Sexual harassment allegations and management shakeup (2017) On February 19, 2017, former Uber engineer Susan Fowler published on her website that she was propositioned for sex by a manager and subsequently threatened with termination of employment by another manager if she continued to report the incident. Kalanick was alleged to have been aware of the complaint. On February 27, 2017, Amit Singhal, Uber's Senior Vice President of Engineering, was forced to resign after he failed to disclose a sexual harassment claim against him that occurred while he served as Vice President of Google Search. After investigations led by former attorney general Eric Holder and Arianna Huffington, a member of Uber's board of directors, in June 2017, Uber fired over 20