Ernest Withers famously photographed the Civil Rights Movement, all the while being paid by the FBI to spy on “radicals” like Martin Luther King Jr. and other nonviolent community organizers. Withers’ regard and proximity as photographer gave the FBI a “front-row seat to the civil rights and anti-war movements in Memphis.”
He also snitched to the FBI about where King was staying, meeting, etc. on April 3, 1968. The next day King was assassinated.