Gab is heavily populated with antisemitic, neo-Nazi, and white nationalist users, including those who have been banned from other social media platforms. Many of them use the site to express their hatred toward Jewish people, including with violent threats. One of its users was the gunman who allegedly killed 11 people at Pittsburgh’s Tree of Life synagogue in 2018.

A June 1 report by the Stanford Internet Observatory analyzed content on Gab and concluded that “extreme anti-Semitic, racist and homophobic content is rife, with open praise of Nazism, encouragement of violence against minorities, and ‘Great Replacement’ narratives.”

Gab is run by Andrew Torba, who has frequently made anti-semitic remarks and said that he supports a political movement which doesn’t include Jewish people and other non-Christians. Torba has praised Greene: In July, he said that “she is getting loud with the explicit Christian nationalism and I love to see it. This is great stuff.”

Torba and Greene both appeared at Holocaust denier Nick Fuentes’ white nationalist conference in February.

Greene paid Gab for fundraising shortly after unsuccessful Pennsylvania gubernatorial candidate Doug Mastriano received heavy criticism for paying the site for “consulting.” Mastriano later removed his Gab account and issued a statement distancing himself from its CEO, but never actually criticized Torba or the site for anti-semitism.

Rep. Paul Gosar (R-AZ) and Georgia U.S. Senate candidate Herschel Walker have also run advertising on Gab.