A royal commission investigation has revealed Managers at Crown Resorts were misleading and threatening to Victoria's gaming regulator when they tried to get the company to tighten anti-money laundering protocols at its Melbourne casino.

Jason Cremona from the Victorian Commission for Gambling and Liquor Regulation recommended that Crown take remedial action concerning a policy that left the casino open to being used for money laundering activities but the inquiry heard Crown appeared reluctant to review and change the policy, and became aggressive and threatening for pushing the issue.