Jailed gangland boss George Marrogi has had his decades-long prison sentence extended by one month for a “quick but brutal” attack on a prison officer.

Marrogi, 36, faced the Melbourne Magistrates Court on Thursday afternoon where he pleaded guilty to assaulting a police officer on February 25 last year at the Metropolitan Remand Centre.

The head of a crime syndicate, known as the “Notorious Crime Family”, Marrogi is serving decades in prison for the murder of Kadir Ors in 2016 and running a drug importation empire from behind bars.

Part of a CCTV clip of the attack was played in court, but it stopped short of showing the assault after Marrogi complained he could not see the footage.

Seven officers, several wearing face shields, could be seen lining up in an interstitial space before a

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