Twitter began enforcing new policies Monday to crack down on users who are affiliated with hate groups. The implementation of the rules has resulted in a purse of far-right accounts, including alt-right leaders and white nationalists.

The rules, initially announced by the company in November, penalize users who display “hateful imagery and display names” on their profile or use a “username, display name or profile bio to engage in abusive behavior.

The rules come as the latest part of Twitter’s ongoing efforts to rid its platform of harassment and abuse—an issue the social network has long struggled with. The company began taking particular interest in removing white nationalists and alt-right accounts following the events of Charlottesville, Virginia, earlier this year, in which white supremacists used social media like Twitter to organize a rally that resulted in the death of a counter protester .  

A number of accounts have already been banned by Twitter as a result of the new rules. Most notable among the banned is Jayda Fransen, the deputy leader of Britain First, a far-right political party in the United Kingdom.

Fransen received attention around the world after President Donald Trump retweeted three tweets posted by her account. The videos supposedly depicted Muslims committing acts of violence, though the legitimacy of the videos were called into question.

A second member of the Britain First party, the group’s leader Paul Golding, was also banned from Twitter Monday.

A number of accounts associated with the white nationalist movement have also been removed from the social media platform. Jared Taylor, the founder and editor of the white supremacist magazine “American Renaissance” was suspended, as was the account for his publication.

Two members of the group League of the South, which the Southern Poverty Law Center identifies as a “neo-Confederate group that advocates for a second Southern secession and a society dominated by ‘European Americans,’” were also suspended.

An account for the American Nazi Party was also removed.

“Today, we are starting to enforce these policies across Twitter,” the company said in a blog post Monday . “In our efforts to be more aggressive here, we may make some mistakes and are working on a robust appeals process. We’ll evaluate and iterate on these changes in the coming days and weeks, and will keep you posted on progress along the way.”