Socrates (film)
His enemies, led by a young man named Meletus, accuse him in court, arguing that the philosopher preaches crazy doctrines to the youth, and does not believe in the gods, but demons. Socrates makes his "apology" (i.e., legal defense), but the citizens are against him; so Socrates is sentenced to death, and held in prison, awaiting execution. His disciples are desperate, and one of them, Crito, tries to help him by encouraging him to flee. Socrates rejects this idea, saying he must obey the rulers of the city. Socrates then resolves to die, and dies as soon as he is forced to drink hemlock.
Leon of Salamis
In the "Apology", Plato's Socrates argues that he fears committing injustice more than he fears death. In support of that claim, he cites two incidents in which he, at great personal risk, disobeyed unjust commands of the Athenian government. One of those orders was for him to arrest Leon of Salamis and bring him to the Thirty for execution:
When the oligarchy was established, the Thirty summoned me to the Hall, along with four others, and ordered us to bring Leon from Salamis, that he might be executed. They gave many other orders to many people, in order to implicate as many as possible in their [i.e., the Thirty's] guilt. Then I showed again, not in words but in action, that, if it's not crude of me to say so, death is something I couldn't care less about, but that my whole concern is not to do anything unjust or impious. That government, as powerful as it was, did not frighten me into any wrongdoing. When we left the Hall, the other four went to Salamis and brought in Leon, but I went home. I might have been put to death for this, had not the government fallen shortly afterwards. ("Apology" 32c–d)
From these texts, it is clear that Leon of Salamis had an honorable reputation, he was put to death by the Thirty, and his execution was publicly recognized as unjust and unwarranted. But this leaves open the question of who Leon was.