John O'Leary and the Day Bullets Flew Through Butte's Federal Courtroom

Introduction

On the afternoon of May 21, 1924, inside the granite and terra cotta federal building on North Main Street in Butte, Montana, a convicted bootlegger named John O'Leary rose from his seat, drew two revolvers, and opened fire in a courtroom crowded with lawyers, clerks, and federal Prohibition agents. When the shooting stopped, only one man had been hit: O'Leary himself. The bullet holes left in the judge's bench and a rear courtroom door that day can still be seen inside the building now known as the Mike Mansfield Federal Building and U.S. Courthouse, a physical remnant of one of the more startling episodes of Montana's Prohibition era (GSA). The story of how a respected railroad man and local Democratic Party figure came to fire on federal officers in open court, and how he ultimately walked free, illuminates both an individual tragedy and the strained, often chaotic enforcement of Prohibition law in a mining city long accustomed to vice.

Butte on the Eve of Prohibition

By the early 1920s, Butte had a well-earned reputation as a "wide open town," a place where saloons, gambling houses, and brothels operated with a degree of civic tolerance rare elsewhere in the country. Montana had in fact voted to go dry in 1916, two years ahead of national Prohibition, yet enforcement in Butte remained inconsistent for years afterward, and federal dry agents did not begin serious campaigns against the city's bootleggers until the early 1920s. Federal Judge George M. Bourquin, who presided over the Butte and Helena federal courts, complained in 1922 that investigators sent to root out illegal liquor sales were "discovered quickly" by a community well practiced in looking the other way (Distinctly Montana). Bootlegging in this environment was not a marginal or hidden trade; it was, for many Butte residents, an ordinary and only mildly disreputable way to earn money, and prosecutions of bootleggers, including numerous women who ran stills from their own kitchens, were a regular feature of the federal docket (Murphy 174-94). It was into this atmosphere of loosely enforced law and mounting federal pressure that John O'Leary's public collapse unfolded.

John O'Leary's Life Before the Shooting

John O'Leary, known to family and friends as Jack, was born in Iowa in 1880, the third of seven children of William and Katherine O'Leary. William worked for the railroads, and his career eventually brought the family to Butte, where they settled in 1891 (Montana Standard, "Woebegone Little Character"). After leaving school, O'Leary worked as a smelterman before following his father into railroad work, becoming a switchman for the Great Northern Railway by 1905 and a foreman by 1918; a 1921 notice in The Butte Miner referred to him as the line's "grievance man" (Montana Standard, "Woebegone Little Character"). He was, by most contemporary accounts, a well-regarded figure in Butte's civic and political life. He was active in the city's Democratic Party, ran unsuccessfully for alderman in the city's seventh ward in 1912, and that same year was praised as a hero for helping evacuate a burning building on South Wyoming Street (Montana Standard, "Woebegone Little Character"). Newspaper society notices from the period describe the O'Leary family as close-knit and respected, and John lived next door to his parents on George Street for much of his adult life.

The Descent

The available record suggests that O'Leary's decline began in earnest after his parents relocated to Los Angeles in 1922. Whether that departure caused his subsequent troubles cannot be established with certainty, but the timing is notable: within roughly a year, O'Leary had abandoned his long railroad career for a very different occupation. The 1923 Butte city directory lists him as manager of the Montana Cigar Store on South Main Street, a business that federal dry agents alleged was in fact a front for illegal liquor sales and gambling (Montana Standard, "Woebegone Little Character"). On January 11, 1924, O'Leary was arrested there for violating federal prohibition law, and on May 20, 1924, a federal jury found him guilty of possessing and selling intoxicating liquor. His sentencing hearing was scheduled for the following day. According to testimony given at his later trials, O'Leary's life in these months had unraveled on several fronts at once: he had accumulated substantial gambling debts, and his long-term fiancée had married another man, a blow that family members said had pushed him toward talk of suicide. It should be noted that this account of his motive rests primarily on testimony reported by a single regional source and has not been independently corroborated by a second archival record, and should therefore be treated as testimony rather than settled fact. His younger sister, Josephine, later testified that O'Leary had appeared at her home the night before his sentencing "in a state of wild excitement," asking whether she owned a gun (Montana Standard, "Woebegone Little Character").

The Shooting

On May 21, 1924, O'Leary appeared in the federal courtroom in Butte for sentencing on the liquor conviction. As the deputy clerk called his case, O'Leary stood, produced two revolvers, and began firing in the direction of four federal agents he believed had wronged him. Every shot aimed at the agents missed; the only person struck was O'Leary, who was hit as the gunfire ended, though it has never been conclusively established whether the wound was self-inflicted or caused by return fire from an agent, a point of dispute that persists in local accounts to this day (GSA). One bullet struck the judge's bench, narrowly missing the seated jurist, and another lodged in the upper portion of a rear courtroom door, where the hole remains visible more than a century later (GSA). A separate account describes the number of shots fired as twelve, though this specific figure appears in only one of the sources consulted for this article and cannot be independently confirmed, and should be regarded with appropriate caution (Montana Standard, "Character"). O'Leary was given last rites at the scene, on the assumption that his wound was fatal, but he survived and was transported to a hospital, where he made an unexpected recovery.

Trial, the Insanity Defense, and Acquittal

O'Leary's survival did not end his legal troubles; if anything, it compounded them. By June 6, 1924, while still recovering, he was formally charged with the attempted murder of the four federal agents, and upon his release from the hospital he was indicted by a grand jury in Helena. In the meantime, on October 17, 1924, he was sentenced to ninety days in jail and fined one hundred dollars for the original bootlegging conviction that had precipitated the courtroom shooting. Upon completing that sentence in December, O'Leary was returned to Butte to face trial before Judge Bourquin on the attempted murder charge. His defense attorney, George D. Toole, mounted what was, for the period, an unusual legal strategy, retaining R. B. Tracey, a neurologist from Warm Springs State Hospital, who testified that O'Leary's violent outburst had resulted from "emotional insanity . . . a complete disassociation of personality" (Montana Standard, "Woebegone Little Character"). The jury deliberated for twenty-two hours before deadlocking on Christmas Day 1924, prompting an evidently furious Judge Bourquin to dismiss the panel and reschedule the case for the following month in Helena. On January 19, 1925, a Helena jury unanimously found O'Leary not guilty by reason of insanity, a verdict that, by the account available, further angered the judge who had presided over the earlier mistrial (Montana Standard, "Woebegone Little Character").

Aftermath and Later Life

Acquittal allowed O'Leary to rebuild much of his earlier life. He returned to work for the Great Northern Railway as a switchman and, after his father's death in 1930, rejoined his mother in Los Angeles for a time. He eventually returned to Butte, where he became a familiar, eccentric figure in the city's bar culture in his later years. Kathy Maloney, whose parents owned the Cheery Lounge on West Park Street, recalled to The Montana Standard in 2002 a regular customer in his eighties with long white hair, a Panama hat, and red trousers tucked into Wellington boots, a man her father identified as the same John O'Leary who had shot up the federal courthouse decades earlier (Montana Standard, "Character"). Butte-Silver Bow's Clerk and Recorder's office holds a death certificate for a John M. O'Leary who died on February 9, 1969, at the age of eighty-eight, born in Iowa on August 25, 1880, details consistent with the courthouse shooter's known biography, and the certificate lists his primary occupation as railroad work, matching contemporary 1924 newspaper descriptions of him as a Great Northern grievance man (Montana Standard, "Character"). He is buried in Butte's Holy Cross Cemetery.

Legacy

The building in which the shooting occurred still stands at 400 North Main Street, now known as the Mike Mansfield Federal Building and U.S. Courthouse, renamed in 2002 in honor of Montana's longtime senator and majority leader. Constructed between 1903 and 1904 in the Renaissance Revival style, the building was individually listed on the National Register of Historic Places in 1979 and sits within Butte's National Historic Landmark district (GSA). The bullet hole in the rear courtroom door and the mark on the judge's bench remain part of guided tours of the courthouse, offered as physical evidence of a moment when the tensions of Prohibition-era enforcement in Butte briefly, and almost fatally, erupted into open violence inside the very institution meant to contain it (Montana Standard, "Federal building"). The episode stands as a reminder that Prohibition's costs in Montana were rarely abstract: they were measured in ruined livelihoods, broken engagements, gambling debts, and, on one May afternoon in 1924, gunfire inside a federal courtroom.

Works Cited

"'Character' a Regular at Cheery Lounge." The Montana Standard, 17 June 2023, mtstandard.com/news/local/character-a-regular-at-cheery-lounge/article_ae300637-da29-5a17-a770-6e3be006d25e.html. Accessed 14 July 2026.

"Federal Building in Butte Slated for Multi-Million Dollar Upgrades." The Montana Standard, 26 July 2025, mtstandard.com/news/local/federal-building-in-butte-slated-for-multi-million-dollar-upgrades/article_d1189e8e-a507-5692-b21a-5a2a79b77695.html. Accessed 14 July 2026.

"Mike Mansfield Federal Building and U.S. Courthouse, Butte, MT." U.S. General Services Administration, 29 Jan. 2025, www.gsa.gov/real-estate/historic-preservation/explore-historic-buildings/find-a-building/mike-mansfield-federal-building-and-us-courthouse-butte-mt. Accessed 14 July 2026.

Murphy, Mary. "Bootlegging Mothers and Drinking Daughters: Gender and Prohibition in Butte, Montana." American Quarterly, vol. 46, no. 2, 1994, pp. 174-94.

"Nuts to the Noble Experiment: Montana's Cussed Women Bootleggers." Distinctly Montana, 11 Dec. 2025, www.distinctlymontana.com/nuts-noble-experiment-montanas-cussed-women-bootleggers. Accessed 14 July 2026.

"'Woebegone Little Character' John O'Leary Opened Fire in Butte Federal Court 100 Years Ago." The Montana Standard, mtstandard.com/news/local/john-oleary-butte-montana-courthouse-shooting/article_d757c454-177d-11ef-a05e-4340fc206545.html. Accessed 14 July 2026.