Germany’s Federal Intelligence Service (BND) is known to have cooperated with the United States National Security Agency (NSA) in spying and surveillance efforts in Germany. In 2014, a BND employee was arrested for handing over secret documents to the NSA, and WikiLeaks later published a trove of leaked documents on the two agencies’ cooperation.
Reports estimate that the BND collects 220 million sets of metadata per day. This metadata contains information about communications that travel over phone, satellite and internet networks. They record who, when, where, and for how long someone communicates.