This is the 8044th most frequent Russian word.
криминальное
"Криминальное" means "criminal" or "related to crime."
Here, "криминальном" is used as an adjective to describe an act that is against the law.
Его обвиняли в криминальном поступке.
He was accused of a criminal act.
In this example, "криминальных" is an adjective referring to stories connected with criminal activities.
Она писала книгу о криминальных историях.
She was writing a book about criminal stories.
Here, "криминальной" modifies "банде," indicating the gang's involvement in illegal activities.