"Disfellowshipping" wasn't invented until the mid-to-late 30's, well after the end of Prohibition.
And even that was just for "exceptional" cases. The invention of disfellowshipping in the form like it is today (judicial committee of 3 elders, 2 witnesses or confession required, appeals, reinstatement, etc.) wasn't invented until 1951 or so.
There really wasn't any sort of "enforcement mechanism" for undesired behavior until well into the reign of Pappy Knorr.
The stifling stranglehold on "acceptable" behavior arose only slowly, slowly, over decades, like the gradual boiling of the proverbial frog in the pot of water. In the 1920s it was still just a small group and generally the few in at that time had more freedom.
It would be an interesting research project, though, to see what the 1920's literature had to say about alcohol and prohibition.