National Socialism is an (extreme) offspring of Socialism, is entirely left-wing to modern standards and I have actual textual evidence from the man himself to proof it:

"Socialism as the final concept of duty, the ethical duty of work, not just for oneself but also for one’s fellow man’s sake, and above all the principle: Common good before own good, a struggle against all parasitism and especially against easy and unearned income. And we were aware that in this fight we can rely on no one but our own people. We are convinced that socialism in the right sense will only be possible in nations and races that are Aryan, and there in the first place we hope for our own people and are convinced that socialism is inseparable from nationalism."

-- Adolf Hitler, August 15 1920

"The common good before the individual good. (Gemeinnutz geht vor Eigennutz)"

-- Adolf Hitler, February 1920

"Since we are socialists, we must necessarily also be antisemites because we want to fight against the very opposite: materialism and mammonism… How can you not be an antisemite, being a socialist!"

-- Adolf Hitler, August 15 1920

"Because it seems inseparable from the social idea and we do not believe that there could ever exist a state with lasting inner health if it is not built on internal social justice, and so we have joined forces with this knowledge. "

-- Adolf Hitler, August 15 1920

"There are no such things as classes: they cannot be. Class means caste and caste means race."

-- Adolf Hitler, April 12 1922

"To put it quite clearly: we have an economic programme. Point No. 13 in that programme demands the nationalisation of all public companies, in other words socialisation, or what is known here as socialism. … the basic principle of my Party’s economic programme should be made perfectly clear and that is the principle of authority… the good of the community takes priority over that of the individual. But the State should retain control; every owner should feel himself to be an agent of the State; it is his duty not to misuse his possessions to the detriment of the State or the interests of his fellow countrymen. That is the overriding point. The Third Reich will always retain the right to control property owners. If you say that the bourgeoisie is tearing its hair over the question of private property, that does not affect me in the least. Does the bourgeoisie expect some consideration from me?… Today’s bourgeoisie is rotten to the core; it has no ideals any more; all it wants to do is earn money and so it does me what damage it can. The bourgeois press does me damage too and would like to consign me and my movement to the devil. "

-- Adolf Hitler, 1931

"There is a difference between the theoretical knowledge of socialism and the practical life of socialism. People are not born socialists, but must first be taught how to become them."

-- Adolf Hitler, October 5 1937

"We are Socialists, we are enemies of the capitalistic economic system for the exploitation of the economically weak, with its unfair salaries, with its unseemly evaluation of a human being according to wealth and property instead of responsibility and performance and we are all determined to destroy this system under all conditions."

-- Adolf Hitler, May 1 1927

Sources, so you can read these actual quotes yourself:

https://en.wikiquote.org/wiki/Adolf_Hitler

http://quotes.liberty-tree.ca/quote_blog/Adolf.Hitler.Quote....

As an added bonus I also would like to point out that Mr. Hitler hated "the Left" (as in Marxist Socialism, but mainly because he didn't believe in "their kind of Socialism") as much as "the Right" (Liberalism/Libertarianism). He saw both as enemies of the German people. So why both classical liberals and libertarians alike are branded as "fascists" or "national socialists" these days is beyond me, because it is historically false.

Secondly, I would like to point out that I am not at all a fan of Hitler and Nazi Germany but I do like to spend a lot of time studying history as it happened, and I still very much hope others will find the time to do the same aswell. If only to avert the biggest disaster Western civilization has ever faced in the near future (or let me put it otherwise: I agree with Charlie that a devastating event will happen in the near future. I disagree however that the Alt-Right, and solely the Alt-Right, will be the cause of this event. Because entoxicating extremism is literally anywhere and everywhere on the political spectrum these days).