I can give a fairly authoritative answer on this one. My late father was a journalist for decades in Seattle. Started out as a police beat reporter for the Daily Olympian and finished his on-air career as the investigative reporter for KIRO-AM. Covered the '69 Seattle PD payoff scandals for KING-TV (I practically grew up in the KING newsroom).

Anyway, dad knew everyone in Seattle law enforcement and politics. He always said of the Colacurcios that they were small-time pimps with no real connections to organized crime. He was quite dismissive of them. After all, they only had a couple of strip joints. Gangsters they were not.

According to dad the only presence the mob may have had in Seattle was through the Rosellini family back in the 30's. He used to tease my mom's mom about being a "mob moll" because she worked as a cook at a Rosellini roadhouse during the Depression. It's doubtful the Rosellinis ever had more than the usual bootlegging connections to the mob during Prohibition. However connected they were it ended when the sons went legit, Al the Rose even serving as governor.

People don't realize how small Seattle was until the Boeing boom and then the first urban renaissance during the late 70's. Too small to support real rackets. And the Italian community was miniscule. Chinese tongs we had, but no LCN.