The NRL has demonstrated a no-nonsense approach to crowd violence by handing life bans to two men following trouble at two recent games.

The incidents followed the Bulldogs and South Sydney match at ANZ Stadium last Monday and Manly's clash with Newcastle at EnergyAustralia Stadium on April 5.

The Bulldogs' 14-12 win over Souths was marred by crowd violence from their supporters that left a security guard bloodied and bruised after being assaulted.

The NRL responded on Saturday by announcing a man had been issued with a life ban for his role in the attack on the guard.

The game's governing body also handed out two five-year bans following incidents from the same game, including one to a spectator who refused to leave ANZ Stadium after violating smoking regulations.

Bulldogs chief executive Todd Greenberg welcomed the banning orders and said the club would not tolerate troublemakers.

"It's pleasing to see the hard work of the authorities has resulted in the issue of banning notices," he told AAP.

"With the technology available today and the detail of CCTV footage, this has provided a strong reminder to all fans that if you behave in a manner that is not in line with community standards it's likely you won't be invited back."

NSW police confirmed this week they were looking into incidents from the night, including one which saw a pregnant woman knocked to the ground while attempting to pass another scuffle.

A Manly fan's life ban was issued after a brawl with Newcastle supporters in the car park outside EnergyAustralia Stadium following the premiers' loss to the Knights.

The incident left two Newcastle fans in hospital with serious facial injuries.

A 23-year-old from Maitland was charged by police with assault and affray.

A five-year ban was also issued to a streaker who entered the playing field at Parramatta Stadium during the Eels' loss to St George Illawarra last Friday night.

In all cases, the NRL bans are game wide and are in addition to any impending police or court proceedings.

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