The story of three peace activists — a drifter, an 82-year-old nun and a house painter — who penetrated the exterior of Y-12 in Tennessee, supposedly one of the most secure nuclear-weapons facilities in the United States.

On dissident filmmakers in Syria.

On the history of Earth Day and the failure of the modern environmental movement.

Shulamith Firestone, one of the first radical feminists, helped to create a new society. But she couldn’t live in it.

The life and work of Aaron Swartz, in context.

On a movement divided.

“What are you doing here?” Loggins asked Janette. Janette thought this an odd question. “It’s Bike to Work Day,” she said. “Did you ride your bike to school?”“Bicycling isn’t allowed at Maple Avenue School,” said Loggins. Janette did a double take. “You’re kidding me,” she said. “Right?”

An undercover cop infiltrates a group of British activists, befriending and then betraying them.

On the intersection of technology and revolt.

A profile of environmental activist Tim DeChristopher.

On the dying city of Port Arthur, Texas, and one man’s fight to save it.

The anatomy of a bungled, massively expensive undercover sting conducted by the Seattle Police Department.

A profile of Canadian politician Jamie Lee Hamilton.

Taibbi on the Tea Party. “After lengthy study of the phenomenon, I’ve concluded that the whole miserable narrative boils down to one stark fact: They’re full of shit.”

Can real activism happen on Twitter and Facebook? Malcolm Gladwell says no.

The audacity of Bill Cosby’s black conservatism.