”带领为“翻译肯定错了，要么是”他带头为穷人说公道话“， 要么是他为穷人说公道话”

「說公道話」 is a idiom, which means stand for justice

I suggest that we could try to understand it by the whole sentence: 他敢于带领为穷苦的人说公道话，不怕因此受到权贵们的打压。 My translation: He is brave to lead the poor and stand out to fight for their rights and justice without fearing repression from bigwigs and influential officials. Explain: Based on the possibility of the situation that the second part of the sentence described: "受到权贵们的打压"(being bullied by those who have powers), the man is courageous to fight aginst it. So "說公道話" means to take actions to prevent unfairness or oppose to it. Not necessarily have to say words from mouth really.

“公道话”or‘讲理’，your understanding is right. the Chinese version and the English version are different, behind “带领”, “穷苦的学生” was missed。according to "He dares to lead impoverished students in saying reasonable words.", it should be "他 敢于 领导/带领穷苦的学生们 说公道话。“

公道话represent justice words, which means this man has confidence to fight with unjustified things.