Yes--restaurants are one example of that, but really just about any small business can be used by a creative smuggler (Carlos Marcello was an honest fruit salesman. . .). Also union groups involved in the transportation industry--Teamsters, Longshoremen have been used that way. And biker gangs were another major means of interstate/trans-border distribution from the 60s through the 90s (the last time I checked into it).
Oh yes, the ports. I should cross post that article to here. Good reminder!