Actually it is. From the bottom of the circle, moving left, towards the top of the circle. When you get about half way - that's your run of the mill Democrat. Keep moving further up about half way from Democrat to the Top of the circle, you get Communists. Keep going - you get Fascism and Totalitarian.
For the right? Same thing. Move from the bottom of the circle to the right - towards the top of the circle. Get to that mid way point and you have your typical Conservative. Keep going towards the top - about half way from that last point to the top. You'll find Authoritarian ideology. Keep going to the top? Fascism.
Fascism is the End Result of going too far left or too far right.