It all started after Conor was stripped of his UFC lightweight title. McGregor and his entourage turned up at a press conference for Saturday's event, headlined by Khabib Nurmagomedov and Max Holloway - who are fighting for the vacant lightweight title.
Conor McGregor then attacked a bus that was carrying numerous fighters at the Barclays Centre.
Conor was then arrested and appeared in a New York City courtroom on Friday afternoon on charges of assault. Conor was charged with three counts of assault and one count of criminal mischief. Sources speculate he could spend up to 7 years in prison.
It now looks like Conor may never be able to fight in NYC again after State Athletic Commission's executive director Kim Sumbler compared him to Charles Manson.
Check out the video below of McGregor and his crew tossing rubbish bins, and attempting to throw metal railing at a bus carrying multiple UFC stars.