This is quite a common question but not an easy one.

Since it has already been asked, I think it is best to provide first the links to those answers, which involve other users who discussed some aspects I am less familiar with.

You can find a first here, a sort of overview here and, if you want, something more about the "socialist" nature of Italian Fascism.

Also, some reading material, as suggested by /u/Sunshine_Bag.

 

These are the most recent posts that I remember addressing the issue. I hope this helps and - of course - you can ask for more.