Those tactics allegedly included impersonating other people, illegally recording conversations and hacking into computers.
Former Uber manager Richard Jacobs, who was fired earlier this year, made the explosive claims in a 37-page letter that sought a big payoff for being forced out of the company.
The letter, written by a lawyer on Jacobs' behalf, has already reshaped a high-profile trial pitting Uber against Waymo, a Google spin-off that accuses its rival of stealing its self-driving car technology.
US District Judge William Alsup, who is overseeing the Waymo-Uber case, took the unusual step of recommending that federal prosecutors consider a criminal probe, based on the evidence and testimony that he had reviewed long before he knew about Jacobs' letter.
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Although most of Jacobs' most damaging allegations were aired in court hearings held two weeks ago, the letter's release sheds more light on the no-holds-barred culture that former Uber CEO Travis Kalanick encouraged.
The scandals spawned by that freewheeling culture have now become a major source of embarrassment for Uber as it tries to recast itself as more compassionate and better- behaved company under a new management team led by Dara Khosrowshahi.
"While we haven't substantiated all the claims in (Jacobs') letter importantly, any related to Waymo our new leadership has made clear that going forward we will compete honestly and fairly, on the strength of our ideas and technology," Uber said in a statement yesterday.
Many of the names and some of the information in Jacobs' letter have been redacted. Jacobs' legal team persuaded Alsup to allow those deletions to protect the identities of former CIA agents that worked with Uber's espionage team, a since disbanded unit called Marketplace Analytics.
Marketplace Analytics allegedly targeted overseas rivals and Waymo in the US while creating a network of secret communications channels and alternate devices designed to cover their digital tracks and avoid legal trouble.
Uber fired both Sullivan and Clark for paying USD 100,000 to two hackers who stole the personal information of drivers and passengers and then covering up the theft.
Uber itself tried to hack into its rivals' computer networks in an effort to scoop up valuable information, Jacobs' letter alleges. In some instances, its agents impersonated drivers and riders on its competitors' services to gain insights.
Sullivan defended himself and the rest of his security team in a statement. "From where I sat, my team acted ethically, with integrity, and in the best interests of our drivers and riders," he said.
Clark "acted appropriately at all times," said his attorney, Mark Howitson.