Far-right groups such as National Action post incendiary messages online. Some lawyers said they could be prosecuted for incitement to racial hatred

British neo-Nazis are using Twitter, YouTube and Facebook to spread their views, including messages claiming “Hitler was right” and death threats to the Labour leader Jeremy Corbyn.

An investigation by The Sunday Times has uncovered far-right material on social media apparently intended to stir up racial hatred and, in some cases, potentially breaking the law.

National Action, a group that appeared to celebrate the recent killing of the Labour MP Jo Cox, has been operating up to eight Twitter accounts calling for “white jihad”.

It also has a YouTube channel on which one video shows supporters giving Nazi salutes with a banner in Newcastle proclaiming: “Refugees not welcome. Hitler was right.”

Another group called North West Infidels has used Facebook to describe all refugees as