Preaching a message of nonviolent resistance, the Rev. Martin Luther King Jr. was the leading voice ... here’s a look back at his defining years in pictures.

The request, which comes on the heels of an executive order by President Trump, represents a sharp reversal for the F.B.I.

Lawrence Phillips, founder and CEO of Green Book Global Walk in the footsteps of one of history's most important figures with a visit to the Martin Luther King, Jr. National Historical Park.