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Sun-Times Media, Al Podgorski, Associated Press
In this March 3, 2012 photo, House Democratic Leader Nancy Pelosi, left, visits with Rev. Willie T. Barrow before a press conference at Operation PUSH headquarters in Chicago. Barrow, a longtime civil right activist, died Thursday, March 12, 2015, at a hospital where she was being treated for a blood clot in her lung. She was 90.

CHICAGO — The Rev. Willie Barrow, a front-line civil rights fighter for decades and a mentor to younger generations of activists, died Thursday in Chicago. She was 90.

Barrow was a field organizer for the Rev. Martin Luther King Jr., marched on Washington and Selma in the '60s and more recently focused concern on Chicago's gun violence and changes to the Voting Rights Act.

Barrow died early Thursday at a hospital where she was being treated for a blood clot in her lung, said fellow activist the Rev. Michael Pfleger.

"She's one of those icons in the movement we've been able to hold onto for a long time, to learn from, to be loved by, to be challenged by," Pfleger said.

Barrow helped organize sit-ins and boycotts in the South with civil rights icons including King, Rosa Parks and the Rev. Ralph Abernathy.

Alongside the Rev. Jesse Jackson, Barrow co-founded the Chicago chapter of Operation Breadbasket, which would become Operation PUSH.

Around Chicago, she was known to many as "godmother" or "mother" for the care she took to advise and inform younger activists.

Her short height belied a fiery, charismatic, tell-it-like-it-is attitude unchecked by either concern for political correctness or the stature of whomever she was addressing.

"She never held her tongue about what she thought. She didn't care who was around," Pfleger said.

She took up causes ranging from women's rights to AIDS awareness. Her son, Keith, died of the disease in 1983.

Barrow was born in Burton, Texas, studied theology at a seminary in Oregon and moved to Chicago in 1945.

Becoming involved in the civil rights movement, Barrow said she always sought to be close to those with power.

"I opened my house up to all of the powerful women in the movement — Coretta Scott King, Dorothy Height, Addie Wyatt," she once told the Chicago Sun-Times. "That's how I learned."

And she wanted to pass that wisdom on to others.

"We have to teach this generation, train more Corettas, more Addies, more Dorothys," she told the newspaper. "If these youth don't know whose shoulders they stand on, they'll take us back to slavery. And I believe that's why the Lord is still keeping me here."