The "left" is huge and diverse (which people don't know because left-wing thinkers don't get the adoration and amplification right-wing thinkers do in this country.)
I am guessing you are referring to Marxist-Lennonists, or even Tankies. Folks who believe that only class oppression is worth fighting, and that the solution is centralized authoritarian regimes with left wing people in power. Those folks are generally anti-liberal, despite being on the left, and deny any history that would complicate their politics.
Alternatively, you might know neoliberals, who believe in the power of capitalism to address social problems and deny any history that might complicate their politics.
Or you might know Syndicalists, who believe unions are the path to worker's political power, and who deny any history that might complicate their politics.
Etc.
If you know one "very left" person, you know one very left person.
I am guessing you are referring to Marxist-Lennonists, or even Tankies. Folks who believe that only class oppression is worth fighting, and that the solution is centralized authoritarian regimes with left wing people in power. Those folks are generally anti-liberal, despite being on the left, and deny any history that would complicate their politics.
Alternatively, you might know neoliberals, who believe in the power of capitalism to address social problems and deny any history that might complicate their politics.
Or you might know Syndicalists, who believe unions are the path to worker's political power, and who deny any history that might complicate their politics.
Etc.
If you know one "very left" person, you know one very left person.