Asked to "sort out" someone, Ian Ronald Crowden initially appeared to approach the man in a friendly manner.
Then Crowden knocked him to the ground with a single blow.
After Crowden repeatedly punched the man's head, four associates joined in using their fists and feet.
Telling the others to get out of the way, Crowden then picked up a one-metre long piece of wood and struck the man in the head up to three times.
The man's injuries included a skull fracture and partially amputated finger, spending five days in hospital.
The attack was among "an array of criminality" by Queensland bikie boss Crowden dating back to 2014, a judgment said.
The gang leader had recruited members to do his bidding "like they were your disciples", showing no remorse for the violence inflicted.
He even hospitalised his own gang members for non-compliance.
On one occasion Crowden and about seven others were involved in the assault of a fellow gang member after he had provided a statement to police.
He was punched and kicked about 50 times, losing consciousness.
Then Crowden picked up a hammer, smashing the gang member's hand about three times before hitting his legs.
The gang member's injuries included ankle and hand fractures, the latter requiring surgery.
The same gang member was bashed again when Crowden accused him of dissension, the judgment said.
During the assault Crowden broke a plastic chair by slamming it into the gang member's ribs.
"Half your pill business is now mine, your bike’s now mine. I am taking your bike - you're not f***ing riding it anymore," Crowden said after the assault.
Crowden had taken a disliking to the gang member after he "refused to stop communicating with a female" and did not take out a home loan on behalf of the bikie boss, the judgment said.
He also threatened other gang members after learning a bikie wanted to leave the group for family reasons.
At a gang meeting Crowden placed a loaded handgun on a table and asked about the bikie's whereabouts.
"If we find out anyone is lying, they will be receiving a bullet," he said.
Crowden later said: "Who wants to f***ing leave now?”
Crowden was last year sentenced to a total of 11 years in jail after pleading guilty on 14 counts in Brisbane Supreme Court.
It included a five-year sentence for a six-week period of drug trafficking that Crowden sought to appeal, claiming it was manifestly excessive.
His legal team suggested three-and-a-half years instead.
However, the Court of Appeal on Friday refused the application for leave to appeal against the drug trafficking sentence.
Crowden, 48, must serve 80 per cent of his 11-year sentence before being eligible for parole.
