The Portland Rum Riot, also called the Maine Law Riot, was a brief but violent period of civil unrest that occurred in Portland, Maine on June 2, 1855 in response to the Maine law which prohibited the sale and manufacture of alcohol in the state the year before.
The Maine law of 1851 outlawed the manufacture and sale of alcohol in the state of Maine, except for medicinal and mechanical purposes. Rumors began to spread that Portland Mayor Neal S. Dow, (1804–1897), an outspoken prohibitionist also known as the "Napoleon of Temperance", was keeping a large supply of alcohol in the city. Dow had authorized a shipment of $1,600 worth of "medicinal and mechanical alcohol" that was being stored in the city for distribution to pharmacists and doctors (as was authorized under the Maine law) but this detail was not widely reported. To further complicate matters, Dow and the city alderman began a vocal battle over the shipment because they had not authorized the expenditure.
Portland’s large Irish immigrant population were particularly vocal critics of the Maine Law, seeing it as thinly veiled racist attack on their culture. They already disliked and distrusted Dow and this incident made him appear to be a hypocrite. The Maine law that Dow had sponsored had a mechanism whereby any three voters could apply for a search warrant if they suspected someone was selling liquor illegally. Three men did appear before a judge, who was compelled to issue a search warrant.
On the afternoon of June 2, a crowd began to gather outside the building where the spirits were being held. The crowd numbered about 200 by 5:00 p.m. and grew larger and more agitated as the day progressed. Separate contemporary accounts place the crowd's size between 1,000 and 3,000 by evening. As the crowd became larger, rock throwing and shoving began.
Police were unable to deal with the growing mob and Dow called out the militia. The exact details of the climax of the riot have been hotly debated. What is known is that after ordering the protesters to disperse, the militia detachment fired into the crowd on Dow's orders. One man, John Robbins, an immigrant and mate of a Maine sailing vessel from Deer Isle, was killed and seven others were wounded.
The crowd was dispersed but Dow was widely criticized for his heavy handed tactics during the incident.
In a twist of irony, Dow was later prosecuted for violation of the Maine Law for improperly acquiring the alcohol. The prosecutor was former U.S. Attorney General Nathan Clifford and the defense attorney was later U.S. Senator and Secretary of the Treasury William P. Fessenden. Dow was acquitted, but the event was a major contributing factor to the repeal of the Maine law in 1856.