If I were to create a linear spectrum, I’d probably put anarchism on one end and totalitarianism (in its many forms) on the other end. It really has less to do with economics than it does with government control. If you add in economics (which is what socialism, by definition, is based on) you can’t really do a linear spectrum.
But what we were taught back in the day (Communism vs Facism) was pretty mainstream and still is. There is a reason why the media still calls Neo-Fascists groups as “far right” and socialists/communists as “far left”.
Had to have come from somewhere right?
It did have to come from somewhere and I really wonder where. I think telling people fascism is far right has three consequences.
One is that people are stupid. If you tell some right wingers fascism is a right wing ideology, they will become fascists.
Another is people are stupid. Left wingers will separate socialism and fascism in their minds and forget the last 180 years of history.
The last is people are stupid. If a group were to be able to influence the right and the left, create a false conflict, either a socialist state or a fascist state (that would be socialist by virtue of dictatorship) would arise.