He and his classmates from a historically Black college in Greensboro, N.C., desegregated a Woolworth’s lunch counter in 1960, inspiring similar protests across the nation.

Crime has fallen since federal agents started policing the streets of Washington in large numbers. Court records show that they have been involved in about a third of arrests that resulted in prosecution, many of them for minor offenses.

© Kenny Holston/The New York Times

The deployment of federal agents and National Guard troops has caused some Black parents to return to the days of “the talk” about policing that they had hoped was no longer needed to keep their children safe.

© Tierney L. Cross/The New York Times

Known more for their museums, monuments and government buildings than their culture, Washingtonians are showing a spirit of dissent as protesters dog federal agents in their streets.

© Tierney L. Cross/The New York Times

More than 2,200 troops were deployed in Washington as of Sunday, a Guard spokesman said.

© Rod Lamkey/Associated Press