Megaupload One of the world largest file-sharing sites was shut down Thursday, and its founder and several company executives were charged with violating piracy laws, federal prosecutors said.

An indictment accuses Megaupload.com of costing copyright holders more than $500 million in lost revenue from pirated films and other content. The indictment was unsealed one day after websites including Wikipedia and Craigslist shut down in protest of two congressional proposals intended to thwart online piracy.

The Justice Department said in a statement that Kim Dotcom, formerly known as Kim Schmitz, and three others were arrested Thursday in New Zealand at the request of U.S. officials. Two other defendants are at large.

Megaupload was unique not only because of its massive size and the volume of downloaded content, but also because it had high-profile support from celebrities, musicians and other content producers who are most often the victims of copyright infringement and piracy. Before the website was taken down, it contained endorsements from Kim Kardashian, Alicia Keys and Kanye West, among others.