Matt Edman, a former volunteer Tor developer, created malware used in Operation Torpedo [dailydot.com], and has assisted the U.S. government in its case against Silk Road and Ross Ulbricht:
How does the U.S. government beat Tor, the anonymity software used by millions of people around the world? By hiring someone with experience on the inside. A former Tor Project developer created malware for the Federal Bureau of Investigation that allowed agents to unmask users of the anonymity software.
Matt Edman is a cybersecurity expert who worked as a part-time employee at Tor Project, the nonprofit that builds Tor software and maintains the network, almost a decade ago. Since then, he's developed potent malware used by law enforcement to unmask Tor users. It's been wielded in multiple investigations by federal law-enforcement and U.S. intelligence agencies in several high-profile cases.
"It has come to our attention that Matt Edman, who worked with the Tor Project until 2009, subsequently was employed by a defense contractor working for the FBI to develop anti-Tor malware," the Tor Project confirmed in a statement after being contacted by the Daily Dot.