The 48-year-old was shot in an apparent ambush outside his Altona North home in Melbourne's suburban inner west about 7.45pm on Sunday.
A family member discovered Haddara a short time later, lying near his BMW with gunshot wounds to his upper body, police said.
Paramedics treated Haddara at the scene before he was taken to Royal Melbourne Hospital.
The motive and identity of his shooter or shooters are yet to be established, but the attack is believed to have been targeted given its nature and Haddara's profile.
"This person is known to police, (he has an) extensive history," Detective Inspector Adam Tilley told reporters on Monday.
"We believe his injuries are stable, but he's in a critical condition."
However, Det Insp Tilley said police were not aware of any threats against Haddara or his family prior to the shooting.
Haddara is alleged to be the head of his namesake family clan, linked to Melbourne's illicit tobacco trade.
The Haddara group is reported to have once been a rival of a syndicate led by tobacco kingpin Kazem Hamad.
The latter has been connected to a series of high-profile firebombings in Victoria while fighting for control of importation and distribution of illicit tobacco.
Hamad was arrested by Iraqi authorities following his deportation from Australia in 2023 and recently jailed for life.
Asked if Hamad's group, known as The Commission, was suspected of involvement in the shooting, Det Insp Tilley said nothing was ruled out.
"We're going to review all the intelligence holdings that we have in relation to our victim, and everything is on the table," he said.
Police have requested intelligence from units within the force to assist with their investigations, Det Insp Tilley added.
Operation Eclipse and Taskforce Lunar, established to probe organised crime links to attacks on Melbourne nightlife venues and illicit tobacco trade, are among those units.
"There'll be ongoing information sharing to assist us with our investigation," Det Insp Tilley said.
Haddara last made headlines in 2025 when police withdrew a range of gun charges against him following an investigation into illicit tobacco and organised crime.
He faced an additional charge of affray by using unlawful violence over an incident in Altona North in November 2022, but it was withdrawn in March 2024.
In a statement issued through their lawyers, Haddara's family requested privacy as they "focus on the wellbeing of their loved one".
Officers from the Major Crime Scene Unit remained at the scene into Monday morning, where a stretch of Marigold Avenue was closed to traffic.
Police directed motorists away from the site of the shooting, which was cordoned off under a blanket of fog.
Haddara's brother Mohammed was killed in a shooting on Fifth Avenue in 2009, a short distance from the site of Sunday's shooting, after an argument about a Mercedes borrowed for his sister's wedding.
In 2019, Ali Chaouk was jailed for at least 18 years for the murder.
Ahmed Hablas, the cousin of Chaouk's wife, initially confessed to the killing but retracted his statement and was acquitted by a jury in 2011.
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