Who were the cunningham boys and what happened to them? whats the irony here

The Cunningham boys were troublemaking teenagers who were arrested with Arthur "Boo" Radley. Boo was taken home and locked away from the world by his father but the Cunninghams were sentenced to attend a state juvenile hall of the 1930s. The irony here is that the school actually gave them great education and one of the Cunninghams went to college to become an engineer.
 
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