Imagine you are a member of critical mass, the cycling organization that attempts to educate the public about carbon dioxide pollution from gas vehicles. even though it lacks the organizational structure of a professional movement, it has high levels of member participation. this would be a organization.

[..]This would be a mass protest organization.

Explanation:

A mass protest organization is a kind of social movement organization that seeks changes in society by protesting and demonstrating. It consists of large and informal groups of persons or organizations which center their attention in determined political or social problems. To make it clearer, they introduce, oppose, or bring down a social change.

can you explain it better