Majority Apparent

A group of people in a country that usually aren't representative of the majority, but are so loud and obnoxious when they voice their opinions that it becomes quite easy for someone to mistake them for the majority. They appear to be the majority because they are usually extremely angry when conversing about socio-political issues, and usually protest in very large groups as well. Despite the fact that they're extremely outspoken and annoying, they rarely influence any kind of significant change, much less a positive one.