Transcript for Mothers Who Lost Children to Gun Violence, Police Actions Speak at DNC
This convention Halton night was riveted by a story of grief as a catalyst for change. Orange mom ordinary moms sharing an unspeakable bond. They all saw their black sons' and daughters' lives cut tragically short. ABC's robin Roberts sat down with them. Reporter: Tonight one of the most emotional moments didn't come from a star speaker. But from these women. Everyday mothers who have lived through extraordinary loss. His life ended the day that he was shot and killed for playing loud music. But my job as his mother didn't. Reporter: They all saw their sons and daughters' lives violently cut short. I am here today for my son, trayvon martin, who is in heaven. Reporter: In their memory, they are now uniting for the one candidate they believe can make change. I am here with Hillary Clinton. Because she is a leader and a mother who will say our children's names. Reporter: I sat down with these seven women, collectively called the mothers of the movement. I know her heart. I know her heart. You know, it's just like -- I know them. It's like I know the pain because I live the pain every day. A driver asking the people in another car to turn their music down. Moments later the scene turns deadly. I'm the mother of Jordan Davis, the young man shot and killed in Jacksonville, Florida, for playing loud music in his car. Sabrina Fulton, mother of trayvon martin. He was coming from a store and a neighborhood crime watcher decides to follow him and murder him. Reporter: The details of their tragedies differ, in some cases not everyone agrees about what happened. But each of their children's deaths sparked outcry and cast a spotlight on what they say is injustice ingrained in our country. Geneva, mother of Sandra bland. She ended up dead in a jail cell. Maria Hamilton. My son was dontre Hamilton. Dontre Hamilton was shot and killed -- My baby had 21 bullet holes in his body. I did not get any justice. I am Cleopatra Callie, mother of the late hydea Pendleton. Somebody thought she was part of a gang, shot in the back, and ultimately met her demise. Leslie mcspannon, my son is Michael brown. He was killed on August 9th in Ferguson. I am the motor of Eric Gardner, murdered two weeks ago last week in Staten island. ! I can't breathe. 11 times he said, "I can't breathe." I can't breathe. You've heard that from demonstrators across the country using that as their battle cry. I know that you have -- you retired from the mta. Is that important to you, to say this is going to be my life's mission at this point? Yes. I never thought that I would be in this position. I was thrown into it. I never wanted this. I'd rather have my son today that I could talk to him on the phone or visit him. Reporter: These women and other mothers who have lost children invited to voice their concerns privately with Hillary Clinton. From your perspective, Mrs. Clinton, what can we do? Well, I think you can continue to speak out, but you will be more effective if you do somehow band together. Reporter: Their candid conversation captured in a video showcased tonight. What did you say to her? We talked about the injustices that we continue to see happen within our communities again and again and again. She contacted us. She still calls us. We still get letters. What is it that you want, and there's just no room for negotiation, has to change, in your opinion? Background check legislation. Keeping guns out of the hands of people who should not have guns. Our leaders need to be accountable. She's the first presidential candidate that I'm aware of that has just said, this is a national crisis, it has to be dealt with, our communities and our families will never be safe unless we deal with gun violence in this country. Reporter: They say S these past tumultuous weeks of almost unbearable violence in our country prove the issues they stand for are as prevalent as ever. When you had the two killings of black men, and then the killing of police officers, how do you all handle this unrest that we see in this country right now? I couldn't watch the TV. I couldn't watch any of it. It was too much for me. What is your feeling when you see what we have and how police officers feel that they have been targeted? What they feel is what we've been talking about. Those are the issues that people have been living every day. Every day. So what you see happening to the police now, why they're being targeted is because of all of the root of the systemic racism and the poverty and there's a bursting at the seams here. We don't hate police officers. No, not at all. You know, absolutely we don't hate police officers. Right. I think that a lot of people get caught up on the uniform. But under that uniform is somebody that belongs to somebody who really loves them. Reporter: And that's what's at the heart of their mission, finding ways to see past what divides us and creating a safer future for all children. I was taught that you want to cause a reaction that's going to lead to action. What is it that you want this message to be? Don't wait for tragedy to knock on your door. Start doing something now in the communities to help your neighborhood. Help your communities. We might be the seven that are sitting here. But it's so much bigger than us. It's something that has been placed inside us that says, listen. You can't help your son or daughters, but you certainly can help other children. Strength, love, and peace. Thank you. Reporter: For "Nightline," I'm robin Roberts in Philadelphia.
This transcript has been automatically generated and may not be 100% accurate.