Claiming the Nazi's were leftists is twisting history. They came to power after having regularly street fights in Germany against the real leftists, the Communists.
Actually they were elected to power but who cares about that little fact. They hated the communists so much that they teamed up with them. Lets take history and use the parts that are convenient to our arguments and ignore the rest. If history doesnt have what we want, we will just start inventing history to prove our point.