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Mr. Gainor agrees that there are similarities between the U.S. and the decadent “Panem” of “The Hunger Games,” but they aren’t what the Harry Potter Alliance has in mind. For example, Panem’s central technological achievement is its high-speed train, a form of mass transit popular with liberal government planners.

In the book, heroine Katniss has to sneak through a hole in the fence to hunt in the forest, which has been blocked off by the government — bringing to mind the fights over land use in the West between federal property owners in Washington and local residents.

On top of that, she sells and trades some of her game at an illegal market set up by residents of District 12.

“You could clearly argue that Katniss is an entrepreneur,” Mr. Gainor said. “How different is this from Ayn Rand? In both cases, you have a corrupt government stamping down people’s entrepreneurial spirit and creativity, and saying, ‘You can’t do that.’”

The Harry Potter Alliance isn’t just a basement startup. Founded in 2005, the group receives funding from Chase Community Giving of JPMorgan Chase & Co., as well as the Roddick Foundation and hipster outlets such as the Foundation to Decrease Worldsuck and the fan site LeakyCon, according to the website.

The alliance’s previous campaigns include a book donation drive, support for fair-trade chocolate, and a phone bank for same-sex marriage in Rhode Island that cited Harry Potter’s years of living in a cupboard under his aunt and uncle’s stairs as a reminder that “no one should have to live inside of a closet for their identity,” Mr. Slack said.

The sequel to “The Hunger Games” has been a blockbluster, grossing more than $573 million worldwide through Sunday.