You don't have to buy it, but we're buddies and it's certainly interesting. Here's a law firm's website talking about it: Class Action Attorney: What is a Class Action Lawsuit? So yes, there has to be a group of people, but one person can sue on behalf of all of them. I don't know the details about these cases, but from what I gather one individual getting a call from a dialer on their cell phone allows them to sue on behalf of everyone similarly situated. Again, I'm not giving out legal advice, just trying to help folks out.