The names were posted to a Discord server — an online messaging and file sharing service popular among gamers.

According to Buzzfeed, the document was originally posted by user kanuke7 and contains thousands of names and social media accounts of anti-Trumpers.

The original list originated from a refusefascism.org petition. On the Discord, the original poster shared a link to the petition and a caption: "These f**king imbecilic 'antifa' have given us a wonderful gift!! They have created a list of names for /pol/ to crawl through and cross check all the hundreds of antifa sympathizers."

The original Refusefascism.org petition was circulated among people who signed it to condemn the Trump administration.

“We REFUSE to Accept a Fascist America! Drive Out the Trump/Pence Regime,” the petition read. “The Trump/Pence Regime is a Fascist Regime. Not insult or exaggeration, this is what it is. For the future of humanity and the planet, we, the people, must drive this regime out.”

Users on the Discord server found a way to look up the information of people who signed the petition and shared their information online. 

When Refusefacism.org was made aware of the breach, they released a statement Sunday condemning the drive.

"It has come to our attention that a network of 'alt-right' fascists have, in the most cowardly and thuggish way, unleashed a campaign to dig into and publish everything they can find about the personal lives of the thousands of individuals who courageously and righteously signed the Call to Action issued by Refuse Fascism," they wrote. "In this same spirit, we will respond to this attack by exposing to the world the nature and danger posed by these fascist cowards, by defeating their attempts to destroy people’s lives, and by bringing forward even more people to stand up against the fascist regime to say: NO! We REFUSE to Accept a Fascist America."

The website has not taken down the page listing every signatory of the petition.