Woody Guthrie’s “This Land Is Your Land” has lost a bit of its protest oomph—in part because of a decades-long denial of its later verses.

Gene Sharp, repeatedly nominated for the Nobel Peace Prize, has been called the "Machiavelli of nonviolence" and the "Clausewitz of nonviolent warfare."

The last clause of the First Amendment guarantees the right to "petition the Government for a redress of grievances." Where did this idea come from?

Americans have turned to street protests to achieve their political goals—while critics have warned that this kind of public action won’t change anything.

For James Baldwin (1924-1987), the fundamental premises of American society needed revisiting. How we might view #BlackLivesMatter through his lens.

Mexico’s struggle for education reform has been a long journey paved in protests. Today's struggles have been a long time in the making.

How demonstrators can use their collective strength to force local governments to address a set of grievances.