Looks like they are professional rabble-rousers.
http://www.iww.org/
The IWW is a member-run union for all workers, a union dedicated to organizing on the job, in our industries and in our communities. IWW members are organizing to win better conditions today and build a world with economic democracy tomorrow. We want our workplaces run for the benefit of workers and communities rather than for a handful of bosses and executives.
The IWW’s Stance on Ecology - Between these two classes a struggle must go on until the workers of the world organize as a class, take possession of the means of production, abolish the wage system, and live in harmony with the Earth.