WASHINGTON--Michael Eric Dyson is on a rescue mission, a mission to deliver Martin Luther King Jr. from his holiday, his halo and the hollow hero worship of a nation that has forgotten how much better it likes him dead than alive.

King, Dyson argues in his new book, "I May Not Get There With You: The True Martin Luther King Jr." (Free Press), was "the greatest American in our history." But to understand why, Dyson says, Americans must recall and reclaim the King whom FBI Director J. Edgar Hoover called "the most dangerous Negro in America."

"I have a problem with the namby-pamby, we-are-the-world,Michael-Jackson King--I could probably add Quincy Jones," says Dyson, kicking off a national book tour before a small, rapt audience at a Washington bookstore. "I am tired of the representation of King as basically this safe Negro. I think he was a very radical brother. I think he was a very dangerous man. He didn't get killed because he was dreaming."

The next morning, a Sunday, Dyson is preaching before several hundred at Union Temple Baptist Church. He is recalling for them King's last sermon in Washington, at the National Cathedral, where, years after his "I Have a Dream" speech, King lamented that most Americans were unconscious racists, that most white people were unable to confront systematic bigotry.

"That's not the King whom you are going to be hearing about on his birthday, that isn't the Burger King King," roars Dyson, who is an ordained Baptist minister as well as the Ida B. Wells Barnett professor at DePaul University in Chicago.

In anticipation of the Jan. 17 national King holiday, Dyson says, "Iam trying to challenge people to remember that King, to resurrect that Martin Luther King. That King is a King who is useful to us right now."

It is, Dyson says in an interview, the King who by the time of his death was publicly calling for a more aggressive and disruptive nonviolence, who privately had come to believe the answer to American inequality rested in democratic socialism, who said blacks might have to self-segregate for a time to prepare themselves for liberation. It is the King, Dyson argues, who has a lot more in common with the dead gangsta rapper Tupac Shakur than with black businessman Ward Connerly of California, who has repeatedly deployed King's words in his campaign to end race-conscious affirmative action.

Most every schoolchild knows that Martin Luther King had a dream, and every politician right of center knows what he dreamt: "that my four little children will one day live in a nation where they will not be judged by the color of their skin but by the content of their character."

Connerly and those right-of-center politicians have used the line to argue that affirmative action as now practiced isn't what King was dreaming of. Dyson has spent a lot of time debating Connerly and others at public forums. It was his growing irritation at the use of King as "the poster boy" for a cause Dyson is quite confident he would have detested, that prompted him to write this book, which he describes as a work of "biocriticism."

"Martin Luther King in his life was saying that America was a deeply rotted racist society," says Dyson. "We freeze him at the Lincoln Memorial. `I have a dream.' We love those cadences that rolled effortlessly off of his tongue."

In the book Dyson suggests a 10-year moratorium on listening to or reading the "I Have a Dream" speech. Sure, it's one of the great orations in American history. But what Dyson considers its twisted misuse is suffocating the real King, the rest of King. Only when Americans are required to learn more about what the man said and thought than a single line from a single speech will they come to understand who he really was.

For example, says Dyson, "Dr. King wanted something more profound than affirmative action. He wanted racial compensation."

In his 1964 book, "Why We Can't Wait," King said: "No amount of gold could provide an adequate compensation for the exploitation and humiliation of the Negro in America down through the centuries. Not all the wealth of this affluent society could meet the bill."

Instead, King recalled how the GI Bill of Rights, which for all practical purposes excluded blacks, helped a generation of returning servicemen go to college, get jobs and buy homes. What is needed, King wrote, is a "broad-based and gigantic Bill of Rights for the Disadvantaged, our veterans of the long siege of denial."

Dyson was a teen father on welfare before starting classes at Knoxville College, in Tennessee, at 21.

He has written frequently on race, including the books "Making Malcolm: The Myth and Meaning of Malcolm X," "Between God and Gangsta Rap" and "Race Rules: Navigating the Color Line."

His new appointment at DePaul is extraordinary because it permits him to roam across disciplinary boundaries -- philosophy, law,sociology, art, music and communications. It is fitting, though, for a man who in every speech is by turns the Princeton Ph.D., Baptist preacher, hip-hop rapper, mimic, crooner and comic.