Mr. Afifi last year discovered a strange gadget attached to the underside of his car, when he took his car in for an oil change. He was afraid it was a pipe bomb. A friend of his then posted photos of Reddit, asking if anyone knew what it was. With the help of savvy internet observers, and civil rights groups including the ACLU and CAIR, Afifi soon figured out that this was a secret GPS tracking device, placed by the FBI without a warrant to spy on his movements and activities. News of the internet attention spread to FBI agents, who then demanded he return the device to the bureau.