Graffiti attributed to the street artist Banksy is seen near the offices of Britain's eavesdropping agency, Government Communications Headquarters, or GCHQ, in Cheltenham, England, on April 16, 2014. (Reuters/Eddie Keogh)
Graffiti attributed to the street artist Banksy is seen near the offices of Britain's eavesdropping agency, Government Communications Headquarters, or GCHQ, in Cheltenham, England, on April 16, 2014. (Reuters/Eddie Keogh)

Surveillance forces journalists to think and act like spies