Final answer:
The barrio teacher was known for being a mesmerizing lecturer, standing up for the underdog, and his expertise in sociology and philosophy.
Explanation:
The barrio teacher was known to all the pupils in various ways:
- He was a mesmerizing lecturer and had control over the minds of his young students.
- He stood up for the underdog and was known for his devotion to the science of sociology.
- He was well-known among intelligent people, especially in circles of philosophy and psychology.
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