Claressa Shields' brother has just been sentenced to 1 year behind bars for attacking a man at the boxing superstar's weigh-in event back in October.
As you'll recall ... the scene was wild at the Shields-Ivana Habazin pre-fight ceremony in Flint, Mi. -- with Habazin's trainer needing to be rushed to the hospital after witnesses say he was sucker-punched.
The guy -- 68-year-old James Ali Bashir -- was seriously hurt in the attack ... with his face and mouth both swollen and bloodied.