Five police officers in Edmonton, north London, face the sack after smashing their way into a car to arrest the driver.
They shouted “attack, attack” before one officer smashed the car windscreen.
Others dragged the driver to the pavement and handcuffed him.
The officers, all men from Enfield Crime Squad, were not uniformed when the arrest took place.
The driver, a black man in his 20s, can be seen in the footage bleeding from cuts to his face.
The incident took place in June 2008, and is caught on police video.
Officers were also accused of adding a soundtrack to the footage—the Tracy Chapman song “Fast Car”.
They deny this.
Anonymous police sources claimed in the press that the arrest was “hard but fair”.
One even reported, “He was supposed to have had links to a gang and his brother had been killed
while being chased by police.”
The police claimed he was suspected of stealing the car.
But the footage was uncovered during an investigation into corruption involving the officers in question and four others.
They were suspended in February 2009 after allegations that they drove confiscated cars, and used confiscated Playstations, mobile phones and a TV at their base.
A drug dealer also alleged that the officers used water torture on him.
Prosecutors ruled there was not enough evidence to charge the officers over the allegations of corruption.
But the five involved in the attack on the car face a disciplinary hearing on
4 July—they stand accused of “discreditable conduct”.