And next, right here tonight, a big bust of some police and firefighters accused of massive fraud. And adding to the outrage, some of them, reportedly, trying to cash in on one of america's darkest... See More
And next, right here tonight, a big bust of some police and firefighters accused of massive fraud. And adding to the outrage, some of them, reportedly, trying to cash in on one of america's darkest days, 9/11, when real heroes showed real strength. Abc's bob woodruff has the details. Reporter: They were the ones who ran towards the towers. amid smoke and ash, saving lives, tolling for days on the pile. For many police officers and firefighters, the experience at ground zero took a lasting toll -- physically and psychologically. But today, dozens of other retired firefighters and police officers charged with lying, making up claims of 9/11-related mental illness to get millions of taxpayer dollars in disability payouts. An insidious scheme to profit off the worst terror attack in the nation's history. Took advantage of the very people they're sworn to protect. Reporter: Prosecutors claim four ringleaders, including an 89-year-old pension consultant, coached the first responders to appear disoriented in psychological evaluations. Prosecutors say more than a hundred police officers and firefighters lied -- about half of them blaming 9/11 for their disability. But investigators say photographs, video, and postings on social media reveal the defendants "do no appear to be disabled" despite their claims they could "not use a computer," could not drive. Could not shop. Former police officer glenn lieberman, shown here on a jetski, received $175,000 over four years after reportedly saying he couldn't gide. I can only express disgust at the actions of the individuals involved in this scheme. Reporter: There is anger, tonight, among the families of the heroes who died on 9/11. George siller lost his brother, stephen, a firefighter. The firefighters and police i know were digging on the pile right after 9/11 to rescue and then to recover. And many are dying today from the cancer. So, it puts a mark against people like that who are so dedicated. And truly represent what the fire and police are. Reporter: Now, george siller also told me that he is sickened. He's appalled by this alleged fraud. And we really need to remember what his brother stood for, what these heroes do every, single day. And that we shouldn't really focus on these few bad apples, diane. So great to have you on this story, bob. Good to have you here.
This transcript has been automatically generated and may not be 100% accurate.