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YouTube will yank down and ban "hateful" and "supremacist" videos - including those that deny violent, well-documented events such as the Holocaust, the company announced Wednesday.

"Today, we're taking another step in our hate speech policy by specifically prohibiting videos alleging that a group is superior in order to justify discrimination, segregation or exclusion based on qualities like age, gender, race, caste, religion, sexual orientation or veteran status," YouTube said in a blog post.

"This would include, for example, videos that promote or glorify Nazi ideology, which is inherently discriminatory. Finally, we will remove content denying that well-documented violent events, like the Holocaust or the shooting at Sandy Hook Elementary, took place."

Critics have accused the video-sharing website of enabling hate speech by turning a blind eye to it on its platform.