Jackson released a video apology to Brown's family and the community, in which he acknowledged that Brown's body should have been removed from the street much sooner than it was. The young man's remains lay uncovered for more than four hours while police collected evidence.
"I don't want words, I want action," McSpadden said in the AP interview.
The parents, both wearing T-shirts with messages about their son, talked hesitantly about their emotions following their son's death. McSpadden said she feels lost and helpless, and her life will never be normal again. "I have to find a new normal," she said haltingly.
"I'm empty," Brown said quietly. "There's nothing there anymore. It's hard to fill that spot with other happiness."
Brown's parents came to Washington to meet lawmakers and lobby Congress to pass a law requiring police officers to wear cameras during their interactions with the public. They also called on the Justice Department to take over the criminal investigation into the shooting. The Justice Department is already investigating whether Brown's civil rights were violated, and a county grand jury is weighing whether to indict Wilson.
"All of our eyes see the same thing, that it was wrong, an injustice," McSpadden said. "Why wouldn't they come back with an indictment?"
The parents also were invited to the annual awards dinner of the Congressional Black Caucus Foundation, where President Barack Obama spoke of the "corrosive" mistrust between local residents and law enforcement in many communities, brought on, in part, by episodes such as Brown's death. "Too many young men of color feel targeted by law enforcement guilty of walking while black, driving while black, judged by stereotypes that fuel fear and resentment and hopelessness," he said.
Attorney General Eric Holder has met Brown's parents, and they hope his coming departure won't affect the case. Holder announced his resignation Thursday. "I've got confidence in him in that he will make sure that what needs to be done is done before he exits," McSpadden said.
The parents also expressed anger at Ferguson police who wore bracelets in support of Wilson. In a letter released Friday, the Justice Department asks Jackson, the police chief, to "confirm our understanding" that officers in the suburban St. Louis County department won't wear "I am Darren Wilson" bracelets while on duty.
Ferguson residents complained about the black bracelets with white lettering at a meeting with federal officials. The Brown's family lawyer, Benjamin Crump, said the bracelets give an impression that the police lack impartiality in this case.
"It lets me know how they really feel about the situation, and the wrongness that they do," McSpadden said.
Brown Sr. called their efforts a fight for human rights. "They say that this is America, but we're not being treated like we're Americans. Our fight here is to just open other eyes and understand how we're feeling and try to get something done about it."
McSpadden said her son was taught to respect his elders.
"I taught my son respect for a policeman, for you, for this woman, for anybody, so if he felt like he was doing nothing wrong, which I don't believe he was, why would he be in fear of him? You're not supposed to fear the police."
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Follow Jesse J. Holland on Twitter at http://www.twitter.com/jessejholland