Adrian Schoolcraft is a person who worked as a police officer in New York City. He saw some bad things happening at his job, like police officers not doing things the right way and not following rules. Adrian thought that what he was seeing was wrong, so he told his bosses about it.
But instead of listening to him and trying to fix the problems, his bosses got angry at him and tried to make him stop talking about it. They even sent him to a mental hospital for a few days, even though he wasn't really sick.
Eventually, Adrian went to the news and told them what was going on. They listened and they believed him. Other people started to speak up too and soon there was a big investigation.
In the end, Adrian was able to show that the things he was seeing were really happening and some bad police officers were held accountable for their actions. That's why he's known as a person who had the courage to speak up and stand up for what's right.