Power Bikies banned under bold plan.

A Current Affair has been told bikies are attempting to buy businesses inside Warringah Mall and use them as cover for their money laundering rackets.

With outlaw motorcycle gang members now being banned from entering pubs, clubs and restaurants on Sydney's northern beaches, centre managers are keen to ensure the violence does not move into their own backyard.

"Effectively what money laundering is, is the washing or the bringing in of illegal cash and converting it or investing it into a premises and bringing it out as legitimate money - which causes that illegal money, for instance drug money or proceeds of other crime, into effectively clean money," lawyer Richard Mitry explained.

NSW Police are keen to avoid having bikies move north to Warringah and are allowing Westfield to ban them.

The move comes after recent shootings at other Westfield locations in Penrith, in Sydney's west, and Robina, on the Gold Coast