A conference featuring eight prominent 2020 Democrat presidential hopefuls kicked off in Washington, D.C,. with the fiery rallying cry of a fugitive cop-killer on Monday, as the labor and political groups in attendance shouted in unison, "We have nothing to lose but our chains."

Jamal Watkins, the Vice President of Civic Engagement at the NAACP, began by telling the audience at the We the People conference that he would invoke the words of Assata Shakur, also known as Joanne Chesimard.

Shakur was convicted of the 1973 murder of a New Jersey state trooper when she was in the Black Liberation Army. After escaping from prison in 1979, Shakur fled to Cuba, which granted her asylum even as she remains on the FBI's list of most-wanted fugitive terrorists.

"Now I came here not to talk at you -- it's gonna be a long and powerful day," Watkins said. "But I want you to do something with me. I'm gonna actually have you participate with me in repeating some words from a leader by the name of Assata Shakur. So if you could stand up -- if you can't stand, it's okay -- but I want you to repeat after me."

Watkins then quoted Shakur, pausing to let attendees repeat after him: “It is our duty to fight for our freedom. It is our duty to win. We must love each other and support each other. We have nothing to lose but our chains.”

Shakur's words, in turn, were appropriated from the final sentences of Karl Marx and Frederick Engels' Communist Manifesto: "The proletarians have nothing to lose but their chains. They have a world to win. Proletarians of All Countries, Unite!"

Among the groups in attendance were the Sierra Club, MoveOn.org, Planned Parenthood Action Fund, SEIU and Communications Workers of America.

They were drawn to the conference to hear from a series of speakers that included 2020 Democratic White House contenders Cory Booker, Julián Castro, Beto O'Rourke, Amy Klobuchar, Bernie Sanders, Elizabeth Warren, Jay Inslee and Kirsten Gillibrand.

Although there was no indication the candidates embraced Shakur's comments, Democrats and progressives have long embraced the convicted murderer. California Democrat Rep. Maxine Waters, for example, wrote in 1998 to then-Cuban President Fidel Castro to apologize for voting for a resolution that called for Cuba to stop harboring Shakur.

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"I, and some of the Members of the Congressional Black Caucus, mistakenly voted for House Concurrent Resolution 254 which called on the Government of Cuba to extradite to the United States Joanne Chesimard and all other individuals who have fled the United States from political persecution and received political asylum in Cuba," Waters wrote to Castro. "Joanne Chesimard was the birth name of a political activist known to most Members of the Congressional Black Caucus as Assata Shakur. For the record, I am opposed to the resolution. I unequivocally stated that a mistake was made and I would have voted against the legislation."

Notably absent from the conference on Monday was former Vice President Joe Biden, who is grappling with accusations of unwanted touching from two women.