"What's happening to Meek Mill is just one example of how our criminal justice system entraps and harasses hundreds of thousands of black people every day", he wrote.
Mill's lawyers made the new allegation after the judge denied a request he be freed on bail.
Mill's lawyers say in a court filing Monday that the rapper and his representatives were aware of the investigation into Judge Genece Brinkley's conduct since 2016.
The Associated Press reported that Mill's probation officer and a prosecutor recommended that Mill not be jailed.
This whole thing is about a pending appeal on his 2-4 year prison sentence following a probation violation.
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Last month, Brinkley sentenced Mill to a two- to four-year prison term for violating his probation for a 2008 drug and weapon possession conviction.
Meek's lawyer, Joe Tacopina, says Brinkley's decision "continues her long pattern of unfair treatment" of Meek ... and vows they will appeal.
He adds: "As stated on multiple occasions, he has never missed a previous court date in this case and poses absolutely no threat to the community, which makes him an ideal candidate for bail - a conclusion the Commonwealth did not oppose".
"Mr. Williams can be released from prison on bail while we continue to work to overturn this wrongful and unjust sentence". The judge G. Brinkley is the very same judge from Philly and denied both the bail and the emergency petition.