Wired’s Kim Zetter reports on a little known but hugely consequential FBI activity: hacking.

RECENT HEADLINES WARN that the government now has greater authority to hack your computers, in and outside the US. Changes to federal criminal court procedures known as Rule 41 are to blame; they vastly expand how and whom the FBI can legally hack. But just like the NSA’s hacking operations, FBI hacking isn’t new. In fact, the bureau has a long history of surreptitiously hacking us, going back two decades.

That history is almost impossible to document, however, because the hacking happens mostly in secret. Search warrants granting permission to hack get issued using vague, obtuse language that hides what’s really happening, and defense attorneys rarely challenge the hacking tools and techniques in court. There’s also no public accounting of how often the government hacks people. Although federal and state judges have to submit a report to Congress tracking the number and nature of wiretap requests they process each year, no similar requirement exists for hacking tools. As a result, little is known about the invasive tools the bureau, and other law enforcement agencies, use or how they use them. But occasionally, tidbits of information do leak out in court cases and news stories.

Read her story to learn what we know about the FBI’s hacking operations throughout recent history.