This is the first of a three-part series, where we'll explore how Ring transformed from start-up pitch to the technology powering Amazon's privatized surveillance network throughout the United States.

When Ring came to Baltimore, residents believed they were out of options.

Pastor Troy Randall, who lives in northwest Baltimore, said that his neighborhood has been "held hostage" by drug sales and associated violence. Many people want to move, he said, but don't have enough money, while older residents can't move to a new place. People are trapped.

"The police are not doing anything," he said. "They are not getting out of the cars. They're not walking the beat. They allow the guys to continue to sit around and to sell drugs."