Little thieves are hanged, but great ones escape. proverb
Small-time criminals will face the full consequences of the law while those who commit large-scale crimes will go unpunished.
A: He was sentenced to three years in prison for bank robbery; meanwhile, there are some politicians who accept bribes can get away with punishment. B: I see! Little thieves are hanged, but great ones escape.
A: Little thieves are hanged, but great ones escape. B: Yeah! Sometimes I feel that there's no justice in the world at all.
To punish someone or something harshly
Someone is going to receive a harsh punishment for what he or she has done something wrong.
To punish someone for committing a crime
Prison or jail
If you fall for someone's trick the first time then they are at fault.
Are you going to mess with me again? Fool me once, shame on you; fool me twice, shame on me.