In 2010, Vice Magazine commemorated the publication of the Institute for the Study of Totalitarian Regimes' "Prague Through the Lens of the Secret Police" with a set of photos taken by the Soviet-era Czech secret police. As noted, these photos, shot blindly with hidden cameras, are actually pretty good art-photography.
They were spying full-time on average citizens, hoping to catch them in a situation that could lead to a swift arrest and a lengthy incarceration in some dank, hidden cell. With their cameras secreted in a suitcase or under a coat, the agents had no idea what was being captured while they were taking these pictures. Their negatives, in which one finds brilliant snatches of street life from a time that few outsiders were able to see, are full of unexpected gems. Total art from a bunch of Communist lackeys and thugs. Who would have thunk it?