•Why it earns a slot
The play is a landmark dramatization of the conflict between individual truth-telling and collective self-interest, and its central paradox, that a man who serves his community can be destroyed by it for doing so, gave the phrase 'enemy of the people' its enduring political resonance.
Dr. Thomas Stockmann discovers that the celebrated Baths of his Norwegian coastal town are contaminated with deadly bacteria, but when he tries to expose the truth he is systematically abandoned by his brother the Mayor, the liberal press, and the townspeople, who vote to declare him an enemy of the people. Stripped of his post, his income, and his home, Stockmann refuses to recant and resolves to stay and fight, concluding that the strongest man is he who stands most alone.
This distillation is written from the freely available original, which is always the better read when you have the time: gutenberg.org.