There are people who are using the current events as an excuse to sow division and chaos, and Antifa groups are absolutely included.
Interesting definition. Could it be said Abraham Lincoln used violence (in war) for political means?
I presume what was meant here was that 20th C fascist movements got big by the strategic use of street violence, in a way that the relatively liberal societies they worked within weren't equipped to counter.
Obviously not the first movement to use street violence, but (in my understanding) the scale and discipline with which it was deployed was a new and distinctive feature.
What? No, that's the definition of terrorism.
Fascism is an extreme nationalistic ideology pioneered in Italy by Mussolini and adopted by Nazi Germany.