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The kidnapper was sent to prison because of his criminal act.

Could I interpret "his criminal act" as "his crime/criminal behavior?" Thanks.
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You could use 'crime', but 'criminal behaviour', while reprehensible, is not always punishable.
Comments  
Mister MicawberYou could use 'crime', but 'criminal behaviour', while reprehensible, is not always punishable.

Thanks, Mister.

Got it.