Victoria Police have swooped on more than 40 properties including brothels and tattoo parlours, in a series of raids targeting an outlaw motorcycle gang involved in money laundering.

Forty-four warrants were executed on Wednesday on businesses linked to the Comancheros, which also included a South Melbourne law firm, Sin City strip club in Dandenong, an accountancy business in Eltham, and a gym owned by the gang's president Mick Murray.

The Age understands Mr Murray is associated with a self-described "forensic accountant" and high-interest lender, who has helped restructure the gang's financial affairs and conceal assets from the tax office.

Murray was recently sentenced to a six-month custodial sentence, but The Age is not permitted to publish the reason behind his imprisonment.

The Comanchero boss and his wife, Debbie Pitman, are facing bankruptcy after being ordered to pay $3.72 million to the Australian Tax Office in December last year.