The organizers of the Defcon hacking convention have publicly asked U.S. federal government workers not to attend the event this year due to tension in the hacker community caused by the recent revelations about the U.S. government's electronic surveillance efforts. The historically antagonistic relationship between hackers and the government seemed to have eased up in recent years, with three-letter government agencies increasingly looking to recruit cybersecurity talent at high-profile hacker conferences such as Defcon and Black Hat.