After a 14-year old boy was stabbed to death, more than 100 people marched through Birmingham's streets.
Jurors were told that Dea-John Reid was "hunted" by a group shouting racist slurs, and then attacked after a fight over a bag in May 2013.
A 15-year old was convicted for manslaughter, and four others were acquitted for murder.
Campaigners now call for reforms in the selection of jurors.
After a trial, George Khan (39), and Michael Shields (36), were cleared of all charges.
The teenager convicted of Dea-John's murder was exonerated, but he was found guilty of manslaughter. He was sentenced to six and a quarter years imprisonment in May.
Supporters waved banners and placards to demand justice at Twickenham park in College Road Kingstanding.
Family members placed floral tributes in front of the drummers who led the march to Perry Park, Perry Barr.
Joan Morris, his mother, spoke to the crowd and said that she spent her time in court trying to get justice for her son. But it didn't work.
"I need justice."
Birmingham Crown Court's jury was composed of eleven white jurors and one person of south Asian descent.
The jury members in the Crown Courts of England and Wales are chosen randomly. Challenges can be made but the current Crown Prosecution Guidelines do not allow for challenges based upon ethnicity.
Justice 4 Dea-John Campaign has started a petition to change guidance so that black jurors can be assigned to trials in which victims are black.
Bishop Desmond Jaddoo is supporting the family and said that "What failed Dea John Reid's family was the criminal justice system, and we are concerned about how ethnically-mixed juries."
"Where race is an issue, jurors must be balanced so that they understand cultural issues. I think that this was the case."
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