Organizers of a weekend protest in Wichita targeting billionaire brothers Charles and David Koch say about 500 activists have confirmed their plans to attend.

Event coordinator Yvonne Cather told The Wichita Eagle that people are coming from as far away as San Francisco and Washington, D.C., for the 3-day “Occupy Koch Town.”

Wichita is the home of Koch Industries. Organizers of the protests that begin Friday contend the Koch brothers exemplify corporate dominance of politics and distortion of science.

Cather says participating groups oppose the proposed Keystone-XL oil pipeline but it was not the chief motive for the event.

Koch Industries calls the protest a politically motivated attack on the company, which has 50,000 U.S.-based employees. It contends it has no financial stake in the Keystone pipeline.