Justice League of America, Vol. 1

A box containing the secrets of a mobster thought long dead resurface, placing the mobster's son - who was unaware of his father's crimes - in jeopardy. As the League try to protect him, the imprisoned mobster admits that it was he who revealed his own secrets, using his son as bait, which would force his old enemies into revealing themselves. The League protect the son and capture the mobster's enemies.