Police spokeswoman Ros Weatherall said the searches were among eight warrants executed across Perth on October 12, during which police seized items including a baton, a tracking device, 28g of white powder and $56,000 in cash.
Deputy Commissioner Chris Dawson said the operation was indicative of national enforcement agencies working together to address a national issue.
Nationally, 53 persons were charged, 79 search warrants executed and 362 licensed premises patrolled.
‘We will do everything in our power to disrupt, prevent and respond to illegal activity, including the criminal activities of outlaw motorcycle groups,’ Mr Dawson said.
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In a joint operation with the Department of Corrective Services, 71 prison cells occupied by OMCG members were searched and prison contraband was seized.
Three people were charged as a result, and the charges included one count of disorderly behaviour, five counts of possessing a prohibited drug, one of possessing a smoking implement, two of driving with a blood alcohol level in excess of 0.08 per cent, and one driving without a licence.