Why was the iww posters called silent agitators?

The Industrial Workers of the World (IWW), which during its colorful history has pioneered a variety of creative tactics, calls its stickers silent agitators, or silentorganizers. ... Silent agitators were produced by the millions.

They were called silent aligators because they bit anyone who walked by and they were hit were it hurts with the pain of knowing how many lives were lost in battles how many kids lost there fauthers and sometimes there mothers to the thought of being there would prove what happens when peace is out of the question and all hope is lost not every thing has to end up with violence and death or when you look at the poster it stalks you for day