Aeolus451 said:
MrWayne said:

"Opposed to liberalism, Marxism and anarchism, fascism is usually placed on the far-right within the traditional left–right spectrum."

https://en.wikipedia.org/wiki/Fascism

"Since the emergence of fascism in Europe in the first half of the 20th century, the term "fascist" has frequently been used as a pejorative epithet against a wide range of individuals, political movements, governments, public and private institutions, including those that would not usually be classified as fascist in mainstream political science. It usually serves as an emotionally loaded substitute for authoritarian."

https://en.wikipedia.org/wiki/Fascist_(insult)

we should use the scientific definition of Fascism because otherwise the term becomes pretty meaningless. So the Antifa is not a fascist group.

Every moderate leftist person shouldn't sympathize with the Antifa, they are extremists and their goals don't justify their actions. Furthermore, the Antifa might not be the worst scum but always pointing out that there is even bigger scum, is downplaying their actions.

I gave the actual definition of it already. Both the left or right can be fascist. Most of the actual governments that fit the definition of fascism are communist or socialist. Some of that is written by left  leaning academics.

Antifa's beliefs and actions fits the definition of fascism better than the people they are against.They are against free speech completely. They use violence and intimidation against the people who they disagree with politically. Alot of them believe in communism.  Their name is oxymoronic and just serves as misdirection. 

Both the right and left can be authoritarian but fascism is specific to the right just like stalinism is uniquely left wing