You can still see the bullet holes in the wall at Trades Hall in Carlton; remants of a bloody shootout between armed robbers and police in 1915. This is the Great Trades Hall Robbery.
Opening in 1859, the Victorian Trades Hall on Lygon Street is one of the oldest organised labour buildings in the world.
Its construction was funded by local tradies. Flush with success after their campaign for an 8 hour day in 1856, local unions took up a collection from members to fund a new base of operations. The Victorian branch of the Labour Party was founded there, and a number of Victorian unions are still based in the building.
The hall also used to be awash with cash.
Most of the unions operating from the building used the facilities to collect their dues, which were then stored on site before being banked.
As Melbourne expanded rapidly, and the trade labour unions thrived, the sums of money collected by the unions were vast. In the early twentieth century, the building frequently had tens of thousands of pounds kept in it, an enormous sum for the time.
And it was also a poorly kept secret that this money was not heavily secured, being kept in bags in an empty room on the top floor.
In the small hours of October 2, 1915, police Constable William Warren was on patrol in Carlton.
The streets were quiet at that late hour, and the location, a block from Melbourne's police headquarters on Russell Street, were not usually a crime hotspot. But around 2.15am, as Warren walked past the darkened Trades Hall, he could hear a strange tapping sound, coming from inside the building.
While Warren tried to decide what to do, he was joined by Inspector Joseph McKenna, also on patrol. And McKenna felt he knew instantly what the noise was: a team of men trying to crack a safe. A third policeman, Douglas McGrath, joined the group and McKenna left them on the scene, while he dashed back to headquarters for reinforcements.
McKenna returned in a few minutes with several more officers, and the group entered the building.
The building was dark and the police moved cautiously, fanning out across the main staircase that lead to the upper floors. McGrath, an experienced officer with a cool head, took the lead. What happened next was to be much debated.
As the police moved deeper into the hall, they could hear movement in the dark and so challenged anyone there to identify themselves.
They were then fired upon,and so defended themselves with their service revolvers. The hall roared with the sound of a sudden gun battle, shots on both sides blazing in the dark, a chaotic and frightening moment.
Finally, the police managed to subdue the assailants and apprehend them.
There were three burglars, all of them well known to the authorities; John Jackson, Alexander Ward and Richard Buckley, the last an associate of notorious local gangster Squizzy Taylor.
There was also a tragic discovery in the aftermath of the shootout. Constable McGrath, 42 years old and a happily married family man, was found dead, shot by one of the gang.
The case against the accused appeared open and shut; the men admitted that they were after the union dues thought to be stored at the hall (in the end only 30 pounds was in the building at the time), and had been planning the break in for some weeks.
But attributing blame for McGrath's death proved more difficult.
Jackson admitted shooting McGrath, but denied that he intended to kill him. Instead, he said that he ran into McGrath in a corridor and:
'Jackson said a shot was fired which struck him in the leg. He then got his gun out and fired at the Constable's hand.
Jackson said he did not intend to kill McGrath, but just to divert him, and save his own life.'
-The Argus reports Jackson's testimony
But the jury was either not convinced, or considered this explanation irrelevant: Jackson was convicted of murder and sentenced to death.
He was hung at the Melbourne Gaol, a short distance from the crime scene, the following year. His accomplices, Ward and Buckley, were absolved of blame for the killing and served five and six years in prison for robbery, respectively.
And there the matter may have rested.
But from the time the crime was committed, there has been speculation that something else was afoot that night.
More specifically, that what the three culprits were at the Trades Hall to steal was not cash, but secret union documents, of interest to Melbourne's criminal underground.
The rumour has long been that Squizzy Taylor, and his friend and occasional business partner John Wren, were behind the break in.
John Wren was a colourful local identity, a businessman and a behind-the-scenes political player, known for his underworld connections. It was widely held that he had corrupt dealings with local unions - fixing prices, exchanging contracts for kick backs - but had always managed to avoid prosecution, and denied any charges levellled against him.
This version of the story has it that Wren had heard that the unions were also dealing with other criminal figures, on the side, without his knowledge.
And so, he decided to arrange a break in to find out who these other players were, from the unions records. He arranged for three local petty criminals to stage the robbery, and to get the records for him, in exchange for which they could keep any money they found.
This speculation was given full vein in author Frank Hardy's classic local novel 'Power Without Glory,' where character John West (based on Wren) arranges a break in as described above.
Furiously denying the charge, Wren would sue Hardy for libel.
In a sensational case, that dominated local headlines for months, a parade of itnesses came forward to accuse Wren of a wide variety of criminal activity. The presiding judge ultimately threw out the case, stating that Wren's reputation was already so poor that he effectively couldn't be libelled.
For his part, Wren always denied any involvement with the crime.
Which brings us back to the bullet holes; four are still visible in the Trades Hall wall. A small reminder of an unusual, foiled crime, that cost two young men their lives.