The souls in Purgatory pray for us, and their prayers are even more effective than ours, because they are accompanied by their suffering. So, let's pray for them, and let's pray them to pray for us.
One day Padre Pio said to a penitent: "When you gossip about a person it means that you have removed the person from your heart. But be aware, when you remove a man from your heart, Jesus also goes away from your heart with that man."