The term mostly had been invoked by anti-authoritarian leftists derisively toward anyone who still supported the Soviet Union. In time, the usage generalized to apply broadly to authoritarian leftists, such as Marxist-Lenininsts (or Stalinists).
Now is it largely misused by liberals to designate anyone strongly critical of Western imperialism, which includes everyone from anarchists to campists.
The framing of separating the "authoritarian left" from the actual left is basically accurate.
Why is "Far Left" marked as a trademark?