Fears of an all-out underworld gang war in Sydney's southwest as Strike Force Raptor ban 22 people from entering parts of the city after murder of Bassam Hamzy's brother

Police are cracking down on the movements of 22 underworld figures in a desperate bid to prevent a bloody gangland war following a fatal shooting in Sydney's south-west last week. 

Gangland figure Mejid Hamzy, 44, the brother of notorious criminal and Brothers For Life founder Bassam Hamzy, was gunned down outside his home in Condell Park on October 19. 

Mejid's death has already lead to more violence, as police fear the retributions will cause carnage on Sydney's streets.

Mohammed Hamzy, the brother's cousin, has already been stabbed at John Morony Correctional Centre at Windsor following the execution.

Strike Force Raptor have since stepped up their operation targeting criminal networks, issuing public safety orders to 22 men linked to the Hamzy and Alameddine families in a desperate bid to prevent more retaliatory attacks.

Mejid Hamzy was shot dead in Condell Park in Sydney's south-west last week

The public safety orders include no-go zones imposed on 22 men, which also restrict who they could associate with, for 72 hours.

It also means police can search their cars and houses whenever they want.

'Well the time to muck about has passed. We've got people dying on the streets and it's got to stop,' Detective Superintendent Robert Critchlow told radio station 2GB on Tuesday.

'We're sick of this behaviour ... and we won't tolerate ongoing conduct endangering the whole community.' 

'We're not stopping. We're using every legislative power we have to prevent further crime and make these people stop.' 

Mejid was the brother of notorious criminal and Brothers For Life founder Bassam Hamzy

Officers attached from Strike Force Raptor and South West Metropolitan Region have continued a targeted execution of firearm prohibition orders across Sydney’s south-west in addition to the public safety orders issued. 

Police have vowed to use all legislative avenues and powers available to them in their bid to end the gangland war.

'The next step will likely see Serious Crime Prohibition Orders enforced which place huge restrictions on the way of life of those who have been served them,' Detective Superintendent Critchlow said in a statement.

'Anyone involved in these shootings or other violent activity, should expect to be arrested. Shooting into homes, businesses or cars is reckless and dangerous and will not be tolerated by police.

'We will not stop in our pursuit of these reckless and careless individuals who continue to put the community at risk, and if you are involved, wherever you are, whatever you are doing, it is best to assume we are watching your every move.'

Strike Force Raptor have since stepped up their operation targeting criminal networks in Sydney’s south-west following the murder of Mejid Hamzy last week

More than 1,000 mourners attended Mejid Hamzy's funeral in Sydney's south-west last Thursday.

Mejid Hamzy was shot several times outside his duplex in Simmat Avenue, where he lived with his wife and young children. He also cared for the adult orphans of an uncle and aunt who died some years earlier.

He staggered 200m around a corner into Curtin Place where he died outside a friend's home.

The police investigation into his murder is continuing. 

More than 1,000 mourners attended the funeral of Mejid Hamzy, 44, last Thursday

Detectives and Mejid's family fear there will be retaliation for the murder from the slain gangster's associates.

'It's going to get very ugly, I'll tell you that,' a cousin of the dead man told Daily Mail Australia last week

His brother Bassam, 41, is serving 40 years in Goulburn's Supermax jail - Australia's most secure prison - for a string of offences including murder.

Hundreds attended Mejid Hamzy's burial service at Rookwood Cemetery last Thursday