Martin Luther King Jr’s “I have a dream” speech was a defining moment for the civil rights movement, for America, and for King himself.

Fifty years ago this week, King’s soaring words marked a turning point in this country’s long and bitter conversation about race, and earned King a place in history. When we remember Martin Luther King, we remember his dream. It helped awaken an entire nation.

So it’s hard to believe that just over three and a half years after that triumph, King would tell an interviewer that the dream he had that day had in some ways “turned into a nightmare.” But that’s exactly what he said to veteran NBC News correspondent Sander Vanocur on May 8, 1967. In an extraordinary, wide-ranging conversation, King acknowledged the “soul searching,” and “agonizing moments” he’d gone through since his most famous speech. He told Vanocur the “old optimism” of the civil rights movement was “a little superficial” and now needed to be tempered with “a solid realism.” And just 11 months before his death, he spoke bluntly about what he called the “difficult days ahead.” To mark the 50th anniversary of King’s speech, we present highlights from that exclusive, rarely seen interview, newly restored from the original color film.

A lot had changed for King since 1963. John F. Kennedy was gone. He had been impressed by King and had delivered his own historic, nationally televised speech on civil rights in June of that year. Kennedy’s successor Lyndon Johnson won passage of the Civil Rights Act and the Voting Rights Act, declaring in a memorable 1965 speech to Congress, “We shall overcome.” But by 1967 Johnson had taken the country deeply into the war in Vietnam.

King opposed that war – in fact he was one of its most prominent and vocal critics. Just four days before his interview with Vanocur, King delivered a scathing anti-war speech at New York’s Riverside Church, calling the U.S. government “the greatest purveyor of violence in the world today.” It cost him white support, and even angered many blacks, who felt King should confine his message to civil rights. And crucially, it poisoned his relationship with Johnson, who had been a key ally.

By 1967, King also had to contend with the fact that he was no longer the unchallenged leader of the civil rights movement. A new generation, impatient to build on his hard-won gains, increasingly rejected his message of non-violence – preaching “Black Power,” and encouraging oppressed blacks to fight back. In growing numbers, they did. And following the victories of the early Sixties in desegregating schools and lunch counters and securing the right to vote, King took on the far more difficult challenge of battling poverty and economic injustice. He brought his campaign to northern cities, where he was met with fierce, entrenched opposition.

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