Six police officers are taking Scotland Yard to an employment tribunal, claiming they were discriminated against for being white.
The officers, members of the Metropolitan Police Territorial Support Group, were tried and acquitted two years ago over alleged race-related assaults.
Lynne Burns, solicitor for the men, said the police investigation into the officers was racially biased and allegedly favoured the evidence of a black officer who was part of the unit.
"The Department of Professional Standards were allegedly keen to secure conviction in support of the black officer even though the evidence was in favour of the six white officers," Ms Burns said.
A Metropolitan Police spokesman denied the allegations and said they would fight it in the tribunal.
"We are going to defend our position," he said but could not comment further for legal reasons.
One of the officers involved in the trial was accused of assaulting teenagers of Arab background in west London, while another was accused of threatening behaviour and four other officers allegedly covered up the incident.
The matter went to court after the black officer gave evidence against his former colleagues - but all six were cleared at the trial at Kingston Crown Court in 2009.
Bill Wilson, the sergeant who led the team but has since retired, says that after the trial he and others were sidelined.
"I feel very angry, very upset about the way I've been dealt with," Mr Wilson told the BBC.