That's not how the political spectrum works. For one, plenty of political features don't belong on any sensible left-right spectrum (authoritarianism? electoral laws? judicial system?) which makes it obvious that there is no reason why a far-right government and a far-left government cannot have things in common.
In that case, if the left-right spectrum ignores huge parts of political structures, can it really be called a political spectrum?
Now you're getting it!
By that reductive definition, however, fascism is the archetypal far-right ideology.
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