Reference

During the prohibition of alcohol in Nassau County, public safety concerns were primarily managed by the Nassau County Police Department. Rising organized crime due to the illicit distribution of liquor necessitated law enforcement interventions. The department took active measures, including raids and increased patrol efforts, to address the illegal activities stemming from prohibition.

One notable point from a detailed search result is from Wikipedia, which mentions that in 1925, the rise in public safety concerns led to more rigorous actions by the Nassau County Police Department.

Here is an illustrative image from the prohibition era showing police inspecting equipment found in a clandestine brewery: