Accused Sydney bikie killers behind bars

Four bikie gang members who allegedly executed Sydney underworld figure Pasquale Barbaro are behind bars following a dramatic police operation into the murder.

Senior Rebels bikie Abuzar Sultani, who is alleged to have played a large part in gang activity over the past three years, faced court on Wednesday on a string of charges including murder and drug supply.

The 27-year-old was one of nine men arrested in a series of police raids relating to the death of Barbaro, who was shot on an Earlwood footpath on November 14.

Just days after the 35-year-old was gunned down, Police Commissioner Andrew Scipione launched Strike Force Osprey to investigate eight organised crime killings on Sydney's streets in the past 17 months.

Thirteen search warrants were executed in Tuesday's police sting across Sydney, with four of the men arrested being charged with Barbaro's murder.

Sultani and his murder co-accused Siar Munshizada, 28, Joshua Baines, 24, and Mirwais Danishyar, 23, did not apply for bail on Wednesday.

All four men were formally refused bail and will remain in custody until their next court hearing at Burwood Court on December 21.

A fifth man arrested in the raids also faced court on Wednesday for participating in a criminal group.

The others will face court over the next two months.

Police say they expect to make more arrests related to the investigation.