Technology companies have cracked down on neo-Nazi and white supremacist groups online following the Charlottesville rally, blocking content, users and websites deemed to be offensive.

Facebook, Google, Airbnb and Intel, among others, spoke out against ultra-right wing movements in the days after the clashes in Charlottesville, Virginia, in which one person died and 19 were injured.

Google moved swiftly to block neo-Nazi website the Daily Stormer from the internet, deleting it within three hours of its registration. The Daily Stormer moved to the search giant's registry after its original host GoDaddy gave it 24 hours to switch when it published a post that criticised 32-year-old victim Heather Heyer.

Google said the site violated its terms of service, and also blocked its YouTube channel.