Italian rider Romano Fenati has been dropped by his Moto2 team after he grabbed a rival's brake lever while racing in Sunday's San Marino Grand Prix.
The Marinelli Snipers team announced they had terminated the 22-year-old's contract on account of "his unsporting, dangerous and damaging conduct".
"With extreme regret, we have to note that his irresponsible act endangered the life of another rider and can't be apologised for in any way," the team added.
Fenati, who also caused headlines in 2015 when he was penalised for kicking out at Finnish rider Niklas Ajo in a Moto3 warm-up in Argentina, is also set to lose out on another contract for next season.
The rider been due to join MV Agusta's new Moto2 project in 2019, but the boss of the Italian bike manufacturer has vowed to scrap Fenati's contract.
"This has been the worse and saddest thing I ever seen in a bike race. True sportsmen would never act this way," MV Agusta president Giovanni Castiglioni told his 565,000 followers on Instagram.
"Regarding his contract for a future position as rider of MV Agusta Moto2, I will oppose myself in every way to stop it. It won't happen, he doesn't represent our company true values," he added.
Fenati was disqualified on the spot and banned from the next two races after the incident at Misano on Italy's Adriatic coast.
British rider Cal Crutchlow, who finished third in Sunday's MotoGP race, told reporters Fenati should have been banned for life.
"He should never compete on a motorcycle again," said the LCR Honda rider. "He should have walked back to the garage and his team should have just kicked him straight out the back.
"You can't do this to another motorcycle racer. We are risking our lives enough."