Selma - Oprah Winfrey and other actors from the movie Selma marched with hundreds on Sunday ahead of the Martin Luther King Jr holiday to recall the civil rights struggles of the 1960s.
Meanwhile, key black members of Congress invoked recent police shootings of young black men as evidence that reforms are needed to ensure equal justice for all.
Winfrey, also a producer of Selma, helped lead the march with the film's director, Ava DuVernay, actor David Oyelowo, who portrayed King in the movie, and the rapper Common. They and others marched from Selma City Hall to Edmund Pettus Bridge, where civil rights protesters were beaten and tear-gassed by officers in 1965.
"Every single person who was on that bridge is a hero," Winfrey told the marchers. Common and John Legend performed their Oscar-nominated song Glory from the movie as marchers crested the top of the bridge.
The film chronicles the campaign leading up to the historic march from Selma to Montgomery, Alabama, and the subsequent passage of the 1965 Voting Rights Act.
Law enforcement officers used clubs and tear gas on 7 March 1965 — "Bloody Sunday" — on marchers intent on seeking the right for blacks to register to vote. A new march, led by King, began two weeks later and arrived in Montgomery days later with the crowd swelling to 25 000.
McLinda Gilchrist, 63, said the movie should help a younger generation understand what life was like in the 1960s during the struggle to end racial discrimination. "They treated us worse than animals," Gilchrist said.
For Monday's federal holiday, people around the country were remembering King's leadership, some in light of the fatal police shootings that had recently shaken the US, including the death of an unarmed black teen last year in Ferguson, Missouri.
Eight members of the Congressional Black Caucus joined US Rep. William Lacy Clay in Ferguson on Sunday as they invoked King's legacy. They vowed to seek criminal justice reform.
"We need to be outraged when local law enforcement and the justice system repeatedly allow young, unarmed black men to encounter police and then wind up dead with no consequences," the Democrat said. "Not just in Ferguson, but over and over again across this country."
The life and legacy of the Rev Martin Luther King Jr also was being celebrated at the church he pastored in Atlanta.