NEW YORK - The Rev. Al Sharpton has emerged over the past decade as perhaps the nation's most prominent civil rights leader, but he still carries baggage from his early days as a fire-breathing agitator.

Government records obtained by The Associated Press indicate that Sharpton and his business entities owe nearly $1.5 million in overdue taxes and associated penalties.

Now the U.S. attorney is investigating his nonprofit group, a probe that an undeterred Sharpton brushes off as the kind of annoyance that civil rights figures expect from the government.

"Whatever retaliation they do on me, we never stop," he said.

Just this week he led protests against police brutality.

Over the past year, Sharpton's lawyers and the staff of his nonprofit group, the National Action Network, have been negotiating with the federal government over the size of his debt, which they dispute. The group has also been trying to pay off tens of thousands of dollars it owes for failing to properly maintain workers compensation and unemployment insurance.

Charlie King, the organization's interim executive director, said Sharpton and the group he leads were unprepared for their rise in stature in recent years and had trouble dealing with big jumps in donations and income.

"The infrastructure was trying to keep up with that pace, and it was not a perfect fit," he told the AP on Friday. "The National Action Network may not have been perfect, but nothing was going on that was untoward."

He said the organization has new accountants and a new administrative team, and the group recently finally filed long-overdue tax returns.

Sharpton's own debts include $365,558 owed in New York City income tax and $931,397 in unpaid federal income tax, according to a lien filed by the Internal Revenue Service last spring. His for-profit company, Rev. Al Communications, owes the state another $175,962 in delinquent taxes.