A massive boycott backed by the NRA and outdoorsmen and women outraged that the nation’s largest outdoors show banned the exhibition of assault weapons has caused the show’s organizers to abruptly cancel the week-long event in Harrisburg, Pa.

The successful boycott, started by the website mynortheastoutdoors.com, was the biggest demonstration of support by the outdoors industry yet against gun control efforts being pushed in Washington and in several states.