The gate was the place of legal proceedings in ancient cities — where verdicts were given and disputes settled. The command not to oppress the afflicted 'in the gate' is a direct prohibition against using legal or social power to crush those who are already vulnerable. Taking advantage of weakness is a particular form of injustice that God explicitly forbids.
Memory phrase: Do not rob the poor.
Talk about it: Why is it especially wrong to hurt someone who is already struggling?
Prayer: God, help me protect those who are weak, not hurt them.