A community organization typically has specified geographic boundaries, is open to everyone, is dedicated to empowering people, and shows a willingness to pay attention to the broad variety of common concerns its constituency brings to it.
Participation is the key.
He urged us to take charge of our own public lives, as the only way we can all be secure and free. There is no alternative in America. As hard as it sometimes seems, we only survive if we participate. It starts in local communities, where people tend to involve themselves because private and public concerns are so intimately related around needs in schools, housing, jobs, law enforcement and health and welfare. When we do that, we win not only the victories of better schools and neighborhoods more secure against crime, but also confidence and self respect, handling our own affairs, becoming part of the American democratic system.