About 340 police officers swooped across homes and businesses onMonday, arresting 13 people and seizing drugs, cash and luxury items.
Police allege those arrested are members or associates of the criminal gang DLAST HR, which may have overseas links.
One of the men arrested appears to have been a ringleader after the 34-year-old was charged with knowingly directing activities ofa criminal group and recruiting others to assist in carrying outcriminal activities.
Twenty-two properties, including a real-estate and car dealership, were targeted across several suburbs, including Fairfield, Campbelltown and Rossmore.
South West Metro Region Commander Assistant Commissioner Frank Mennilli said the raids, led by the Fairfield Local Area Command, followed two years of hard work.
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He said those targeted had been involved in public shootings and murders.
"We are specifically targeting the head of this group, their activity," he said.
"Some of the information relates to cannabis but what we are talking about is an enterprise, a criminal group that have made thousands upon thousands of dollars through their criminal activities."
The NSW Crime Commission has also been involved in the Strike Force Evesson investigation targeting DLAST HR.
Items seized included eight kilograms of cannabis, almost $25,000 in cash, four jet skis, a boat and a Lotus sports car.
Fairfield Local Area Commander Superintendent Peter Lennon did not rule out links with a wider crime network outside Australia.
"They are domestic although we are aware of some other linksthat they have got," he said.
"I wouldn't call it international but ... it's a little bit more than just domestic."
NSW Police Commissioner Andrew Scipione said police would not rest until every criminal was behind bars.
"It's one that we will be continuing to pay particular attention to and certainly from my perspective you can be assured the NSWpolice will do all we can to break up this and other similargroups," he said.
