What is a simile in Mother to Mother?

"Each word rolled off her tongue as a bullet from a gun: bang! Bang! Bang! Bang!" pg. 37

"The police are not our friends. They are to this day worse than ineffectual...Therefore the perpetrators of evil, those who have made crime a career, live in the benign atmosphere cultivated by that corruption. As warm wet dirt breeds maggots...so have criminals thrived." pg. 36