Very often in a dream we do not seem to be capable of expressing our right to be heard, to articulate those things we believe are correct.

Therefore, to dream of either justice or injustice can indicate that the unconscious mind is trying to sort out right from wrong.

This is usually on a personal level, although it can have a wider implication as to what is morally right and the norm within society. You might like to consult the entries for authority figures in people, balance, juror / jury and verdict.