By Jose Lambiet at Forbes

New York billionaire David Koch was forced to pull down a privacy fence recently erected around his winter property in Palm Beach, Fla.

His staff put up the country-style camouflage net after camera crews from a liberal group filmed the 30,000-square-foot beachfront house, estimated by property tax authorities to be worth $27 million.

The fence went up in early summer after the guerrilla video Brave New Foundation, run by Hollywood producer Bob Greenwald, got kicked off the property by a security guard and town police.

The foundation is working on documentaries for the website Koch Brothers Exposed. The video below shows Greenwald’s crew knocking on the doors of some of homes owned by David and brother Charles Koch, who shares David’s No. 4 ranking in the Forbes 400.

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