Striking Memphis sanitation workers march past Tennessee National Guard troops with fixed bayonets during a 20-block march to City Hall on March 29, 1968. Some 3,800 National Guard troops rolled into the city in armored tanks after the Tennessee legislature enacted a state of emergency.

Striking Memphis sanitation workers march past Tennessee National Guard troops with fixed bayonets during a 20-block march to City Hall on March 29, 1968. Some 3,800 National Guard troops rolled into the city in armored tanks after the Tennessee legislature enacted a state of emergenc