Elon Musk faced a fierce backlash online…

Elon Musk is no stranger to controversy, but his latest retweet has got people up in arms on social media.

Despite being a billionaire and head of a bunch of companies, Musk manages to find plenty of time to be chronically online, most notably on Twitter.

While many of his posts and retweets are centered around his many companies like Tesla and SpaceX, he also posts videos centered around American politics.

This is all normal enough, but his latest retweet has outraged people on Twitter as he shared a post that attempted to downplay the role Adolf Hitler, Joseph Stalin, and Mao Zedong had on the deaths of millions.

The retweeted post read: “Stalin, Mao, and Hitler didn’t murder millions of people. Their public sector workers did.”

Musk has outraged people online after retweeting a controversial post (Photo by SAUL LOEB/AFP via Getty Images)

It didn’t take long for people to hit out against Musk for sharing the post.

One person commented: “Is this the – seriously disturbed and flawed – reasoning why Elon thinks Hitler is so cool? Sieg Heil, Elon – enjoy your burning swasticars…”

With another upset Twitter user adding: “Elon Musk is disgusting POS. I hate him & I hope he starts receiving what he deserves.”

With a third commenting: “Elon Musk to publish anything like this is unbelievable. Shame on you.”

And another hit out at Musk and wrote: “On. Their. Orders.

“These men were dictators. They ORDERED massacres. You can add Putin to that list.

“Elon Musk is again, minimizing the danger of dictatorships and the horrible of living under one. That salute was exactly what the world thought it was!”

As well as normal Twitter users, Lee Saunders, the union president of the American Federation of State, County and Municipal Employees of the AFL-CIO took issue with Musk and hit back at him.

Musk has been accused of making a Nazi salute during a speech during Trump’s inauguration (ANGELA WEISS/AFP via Getty Images)

He replied: “America’s public service workers — our nurses, teachers, firefighters, librarians — chose making our communities safe, healthy and strong over getting rich. They are not, as the world’s richest man implies, genocidal murderers.”

He added: “Elon Musk and the billionaires in this administration have no idea what real people go through every day. That’s why he’s so willing to take a chainsaw to people’s jobs, Medicaid, Social Security and Medicare.”

This comes after Musk faced accusations that he made a Nazi salute during Trump’s inauguration.

He dealt with these accusations by taking to Twitter to make a series of jokes and puns regarding notorious Nazi leaders.