Three peace activists have been convicted for infiltrating the U.S. government’s lone site for handling and processing weapons-grade uranium last July. Calling themselves the “Transform Now Plowshares,” the three cut through fences to paint slogans and throw blood on the wall of the Y12 nuclear weapons plant in Oak Ridge, Tennessee. The Y12 facility processes uranium for new hydrogen bombs and makes nuclear warheads. On Wednesday, a jury found the three activists — 83-year-old nun Sister Megan Rice, Vietnam War veteran Michael Walli, and Greg Boertje-Obed — guilty of damaging a so-called “national defense” site. The charges carry a prison sentence of up to 20 years.