Last Podcast on the Left
Episode 628: The Great Molasses Flood of 1919 Part II - The Boston Molassacre
Release Date: August 1, 2025

Summary

In Episode 628 of "Last Podcast on the Left," hosts Marcus Parks, Henry Zebrowski, and Ed Larson delve deeper into the harrowing events of the Great Molasses Flood of 1919 in Boston. This detailed exploration not only recounts the catastrophic flood but also examines the socio-political climate of the time, the ensuing chaos, and the long-term repercussions on both the community and industrial regulations.

Background: Prohibition and Industrial Molasses Use

The episode begins by setting the stage for the Great Molasses Flood, highlighting the intersection of Prohibition and industrial alcohol production. As Prohibition loomed with the impending ratification of the 18th Amendment in early 1919, the United States Industrial Alcohol Company (USIA) was under pressure to maximize grain alcohol production to supply the upcoming illegal alcohol market.

Key Points:

• Prohibition's Impact: The one-year grace period before Prohibition allowed companies like USIA to ramp up alcohol production.
• Molasses Tank Construction: USIA erected a massive 50-foot-tall molasses tank in Boston's North End to store 2.3 million gallons of molasses, a critical ingredient for industrial alcohol.

Notable Quote:

Marcus Parks [05:56]: "You know what I like about the 18th amendment and the 21st amendment? It's a very great way to remember it. 18, you're not allowed to drink anymore. 21, you could drink again."

Anarchist Threats and Tank Negligence

Amidst the industrial push, tensions simmered due to stricter immigration laws targeting Italian anarchists—many of whom were intertwined with the labor force surrounding the molasses tank. Arthur P. Gel, the USIA overseer, faced public threats from anarchists who resented the company's dominance and poor working conditions.

Key Points:

• Weak Security Measures: Despite receiving threatening placards, Gel decided against reinstating adequate security, prioritizing profits over safety.
• Structural Failures Ignored: Reports indicated constant leaks, vibrations, and groans from the tank, signs of impending disaster that were systematically ignored.

Notable Quote:

Henry Zebrowski [07:56]: "USIA could make as much grain alcohol as possible before the prohibition deadline, so concerns about the safety of the molasses tank were ignored."

The Catastrophic Flood: January 15, 1919

On a mild January day, the molasses tank reached critical capacity. The mixture of warm molasses from recent shipments and cold molasses already in the tank triggered a fermentation process, producing carbon dioxide and increasing internal pressure beyond the structural limits.

Key Points:

• Pressure Build-Up: The chemical reaction caused by mixing warm and cold molasses led to excessive pressure within the tank.
• Tank Failure: At 12:41 PM, the tank ruptured, unleashing a 25-foot-high, 160-foot-wide wall of molasses moving at 35 mph, devastating the North End neighborhood.

Notable Quote:

Henry Zebrowski [29:04]: "Quite suddenly, a sound not unlike a machine gun, something like was heard by all present, followed by a noise that was described as sounding as if it had come from a wounded beast."

Personal Stories and Immediate Aftermath

The flood wreaked unprecedented havoc, claiming 21 lives and injuring around 150. Personal testimonies paint a vivid and terrifying picture of the chaos, with individuals like Martin Clarty and Giuseppe Iontasca sharing their harrowing experiences of being engulfed by the molasses wave.

Key Points:

• Martin Clarty's Ordeal: As a boxing referee, Martin was napping when the tank burst, experiencing the sensation of drowning in molasses and witnessing his family perish.
• Giuseppe Iontasca's Tragedy: A father of six, Giuseppe watched helplessly as his children were swept away, with only his son Antonio surviving amidst the destruction.

Notable Quote:

Henry Zebrowski [37:53]: "Martin felt himself slide downwards as though the churn of the most violent river rapids in existence were taking him under."

Rescue Efforts and Hospital Chaos

Emergency responders, including police, firefighters, doctors, and nurses, arrived swiftly but were overwhelmed by the sticky and viscous environment. Rescuers struggled to extract survivors from the molasses, often resorting to extreme measures like shooting trapped animals to prevent further suffering.

Key Points:

• Rescue Challenges: The molasses made movements difficult, with No. of living beings trapped in the goo and severe difficulties in identification due to molasses-covered bodies.
• Use of Force: Law enforcement had to euthanize horses trapped in the molasses, adding a layer of grim reality to the disaster.

Notable Quote:

Henry Zebrowski [50:16]: "The only thing that mattered to Arthur P. Gel is what's going to cost the least amount of money and what's going to make him look best to his corporate masters."

Legal Proceedings and Corporate Negligence

In the wake of the disaster, a grand jury failed to indict anyone for criminal negligence, citing insufficient evidence. This led survivors to file 119 civil claims against USIA. The courtroom became a battleground where USIA's defense attempted to shift blame onto anarchists, while plaintiffs presented damning evidence of corporate negligence.

Key Points:

• Defense's Stance: USIA's attorney Charles Choate vehemently denied structural weaknesses, attributing the tank's failure to anarchist sabotage.
• Prosecutors' Evidence: Testimonies from engineers and explosives experts from MIT revealed that the tank was indeed poorly constructed, with steel plates insufficient to handle the pressure.
• Jury Verdict: After extensive testimony spanning nearly a year, USIA was held liable and had to compensate the victims, though the settlement was criticized as insufficient.

Notable Quote:

Henry Zebrowski [81:58]: "Amongst the most damning testimony came from the people who actually made the steel plates, who admitted that the thickness of the plates they delivered was less than what was called for in the plans."

Long-Term Impacts and Regulatory Changes

The Great Molasses Flood had lasting effects on both the community and industrial regulations. Beyond the immediate fatalities and injuries, the disaster prompted significant changes in construction standards, mandating rigorous inspection and verification of engineering calculations to prevent future catastrophes.

Key Points:

• Regulatory Reforms: Boston began requiring detailed engineering calculations to be filed with construction plans, a practice soon adopted nationwide.
• Decline of the Molasses Trade: The flood marked the end of Boston's 300-year molasses trade tradition, with sugar becoming the preferred sweetener.
• Corporate Accountability: The disaster underscored the perils of unchecked corporate greed and negligence, serving as a historical lesson on the importance of regulatory oversight.

Notable Quote:

Henry Zebrowski [87:38]: "Boston began requiring that all calculations from engineers and architects be filed with their plans. That practice soon became standard across the country."

Conclusion: Lessons from the Melted Era

The Great Molasses Flood of 1919 serves as a stark reminder of the devastating consequences that can arise from corporate negligence and inadequate regulatory frameworks. The episode emphasizes the importance of stringent safety measures and accountability in industrial operations to safeguard communities.

Final Insights:

• Corporate Responsibility: Prioritizing profits over safety can lead to tragedies that impact countless lives.
• Regulatory Vigilance: Continuous oversight and enforcement of safety standards are crucial in preventing industrial disasters.
• Community Resilience: The North End community's response and subsequent legal battles highlight the resilience and tenacity of affected populations in seeking justice.

Notable Quote:

Henry Zebrowski [89:56]: "Without safeguards and regulations, corporations will risk the lives of human beings or even sacrifice entire populations if it means that the company's stock price will go up even a little."

Closing Remarks

Episode 628 masterfully intertwines historical facts with engaging storytelling, shedding light on an often-overlooked tragedy. Through personal accounts, legal battles, and the broader socio-economic context, the hosts provide a comprehensive understanding of the Great Molasses Flood and its enduring legacy.

For those seeking a compelling true crime narrative intertwined with dark humor and incisive social commentary, this episode is an essential listen.