WASHINGTON (AP) — This weekend marks the 50th anniversary of “Bloody Sunday,” a civil rights march in which protesters were beaten, trampled and tear-gassed by police at the Edmund Pettus Bridge in Selma, Alabama. On March 7, 1965, marchers were walking from Selma to the state capital, Montgomery, to demand an end to discriminatory practices that robbed blacks of their right to vote. It took two more attempts for marchers to successfully complete their journey. Images of the violence during the first march shocked the nation and turned up the pressure to pass the Voting Rights Act of 1965, which helped open voter rolls to millions of Southern blacks.

Five things to know about Bloody Sunday:

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SELMA TO MONTGOMERY

The march was conceived by James Bevel, one of Martin Luther King Jr.’s aides. After a 26-year-old black church deacon, Jimmie Lee Jackson, was fatally shot by a state trooper during an earlier march in Marion, Alabama, Bevel suggested that protesters carry Jackson’s casket from Marion to the steps of the state capitol. A protest march was planned instead, and the starting point changed to Selma. That march ended in the Bloody Sunday beatings.

Afterward, King issued a call for volunteers and ministers to come to Selma for a second march. However, federal judge Frank M. Johnson had forbidden marches pending his ruling on a petition to shield marchers from police interference. To heed the judge’s order, King led protesters two days later, on Tuesday, March 9, 1965, to the Pettus bridge, where they kneeled, prayed, sang and left. King’s refusal to take the march across the bridge, where Alabama lawmen were waiting, led critics to call the second march “Turnaround Tuesday.”

Johnson ordered federal protection for the marchers, and on March 21, 1965, thousands of marchers made the 50-mile journey to Montgomery. Two other people were also killed during these protests: James Reeb, a white Unitarian minister who was beaten to death by local whites on March 11 and Viola Liuzzo, a white Michigan woman who was fatally shot by the Ku Klux Klan on March 25.

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WHERE WAS KING?

Martin Luther King Jr. was not in Selma for the Bloody Sunday march, although he had been there before working on voting rights issues, even doing a stint in jail there. King was obliged to preach at his church in Atlanta on the day people showed up to march to Montgomery, since it was their “Men’s Day” program, former King aide Andrew Young said. Young said they heard that people were showing up to march and so he immediately headed to Selma.

He and other King aides then telephoned Atlanta to convince King not to call it off.

“We persuaded him that since there were about three hundred people there, maybe they could go ahead and march, that they weren’t going to get far, anyway,” Young said in interviews for the documentary “Eyes on the Prize: America’s Civil Rights Years (1954-1965).” ”That we had seen the state troopers and they were going to probably stop them and turn them around, or maybe they would, people would get arrested.

“So he said, ‘Well, OK, go ahead and march,’ he said, ‘but don’t you all go to jail,'” Young said.

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SHERIFF WITH NO REGRETS

One of the most polarizing figures of the Selma movement was Dallas County Sheriff Jim Clark, who’d already had several confrontations with protesters before the Bloody Sunday beatings. In fact, Clark insisted that the protesters who knelt down to pray before the state troopers attacked had actually provoked the police first. “The marchers fell to the ground and as the troopers moved on to them, that was when they attacked the troopers with ice picks, and straight razors, and knives, and even broken glass,” Clark told interviewers for the same “Eyes on the Prize” documentary. “And that was when they used tear gas on them and they started retreating across the bridge at that time.”

Clark lost his next election in 1966. He ended up selling mobile homes and once was sentenced to prison for conspiring to smuggle marijuana. He died in 2007.

In a 2006 interview, Clark told the Montgomery Advertiser that he did not regret his actions in Selma. “Basically, I’d do the same thing today if I had to do it all over again,” Clark said. “I did what I thought was right to uphold the law.”

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MALCOLM X

Malcolm X had visited Selma in the weeks leading up to Bloody Sunday to support the voting rights movement there. By the time he arrived, King was in a Selma jail for protesting voting discrimination in the South. The two had first met the year before on Capitol Hill during Senate debate of the Civil Rights Act of 1964.

Malcolm X shared the podium with King’s wife, Coretta Scott King, at Brown Chapel African Methodist Episcopal Church, and Mrs. King told “Eyes on the Prize” interviewers that Malcolm X said he had changed his mind about visiting King in jail, and asked her to pass along a message.

“I didn’t come to Selma to make his job more difficult, but I thought that if the white people understood what the alternative was that they would be more inclined to listen to your husband,” she said he told her.

Malcolm X was assassinated on February 21, 1965, in New York City, roughly two weeks before Bloody Sunday.

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CONGRESSIONAL GOLD MEDAL

Congress on Tuesday authorized the awarding of the Congressional Gold Medal to the marchers who participated in all three Selma-to-Montgomery marches. “This nation should never forget the sacrifices those who refused to accept second-class citizenship and demanded that our nation live up to the very ideals on which it was founded.” said Rep. Terri Sewell, D-Ala.

The Congressional Gold Medal is Congress’s highest honor.