A firebomb thug screamed "get into these screws" as guards tried to stop packages being hurled into a prison.
Robert Warnock was involved in the bust-up at Barlinnie as the parcels were tossed over the prison wall into the exercise yard.
The 26 year-old has now been handed another jail-term after he admitted acting in a threatening and abusive manner.
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Warnock was one of six men sentenced to a total of 64 years in November 2022 for orchestrating a string of petrol bomb attacks in Greenock, as revenge for his brother being stabbed.
The prison rammy was sparked as 100 prisoners were in the exercise yard around 2.30pm on January 26, 2019.
Guards were then made aware that a number of packages were thrown over the wall into the exercise yard.
Fiscal Lauren Aitchison told Glasgow Sheriff Court: "Prisoners tried to stop the officers removing the packages and a melee ensued."
Amid the choas, prisoner shouted and swore at the guards trying to control the situation.
Warnock yelled: "Get into these screw b******s".
When that was stated in court, Warnock commented from the dock: "That's a pure whopper, man."
The hearing was told co-accused Amar Baig - who admitted the same charge and will be sentenced later - shouted at the prison officers: "Let him up, you f*****g b******s."
The guards were eventually able to restore order and prisoners removed from the yard.
Amy Spencer, defending Warnock, told the court: "He is now serving two significant sentences, not involving the death of someone but they were serious matters."
Sheriff Mark McGuire sentenced him to six months which will run concurrently to his extensive jail term.
He said: "Your previous convictions do you no credit, you have served custody before and were serving at the time.
"You are clearly serving a long term sentence and as a result there is no alternative to a custodial disposal."
A jury last year heard how Warnock blamed Andrew Sutherland and his half-brother Leonard Cole Jnr for the assault on his own sibling.
Properties and relatives linked to the pair were then targeted in firebomb attacks.
A judge at the High Court in Glasgow told Warnock that he behaved "like a gangster" who wanted to turn Greenock into a "war zone."
He was jailed for more than 15 years having pled guilty to a charge of conspiracy to murder.
The jail term was set to consecutive to the 11-year sentence he was already serving for trying to kill a woman and her partner.
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