Riseup, a "progressive Internet organization" that operates an anonymous remailer had its servers seized by the FBI without notice two weeks ago. They installed a little CCTV camera after the seizure. On Wednesday, that camera recorded footage of the FBI putting the servers back.
On April 18, 2012, a Riseup server located in MF/PL's colocation cabinet and managed by ECN, a progressive provider in Italy, was seized by the FBI. MF/PL found out about the seizure when Riseup reported that there was no response from the server. Technologists visited the server location and found that the machine had been removed.
The FBI is investigating bomb threats being made to facilities and people at the University of Pittsburgh and believed that one of the servers used to email these threats was an anonymous email server operated by ECN. "These servers have no logs or traces of who used them," MF/PL Director Jamie McClelland said. "Nothing useful could be gotten from this seizure but there is a concrete outcome: the seizure disrupted May First's work and disrupted the communications of hundreds of people who lawfully use that server for email and website services everyday."
Anonymous email servers keep no records of their users and are frequently used by activists, organizers and information sources world-wide.