In 1934, strikes by Minneapolis truckers broke the capitalist's anti-union stronghold— at the cost of worker bloodshed.
Direct link to the Daily Strike Bulletin by The Organizer of General Drivers Local 574 from 1934 July 21, where the headline is from.
Additional context, which is very familiar to 21st century direct actions, can be found in Revolutionary Teamsters: The Minneapolis Truckers' Strikes of 1934 by Bryan D. Palmer:
At least sixteen pickets and strike-supporters, many of them suffering gunshot-wounds that were treated at various city-hospitals, found themselves charged with criminal offences, including ‘failing to move for an officer’ or ‘disorderly conduct’. They ranged in age from the 19 year-old student and friend of Eric Sevareid, the ‘rabelaisian’ Dick Scammon, to unemployed and union-men barely out of their teens or as old as fifty. None of the criminal charges stuck in court. Amidst the bloody chaos of the immediate aftermath of the mass shootings, strike-headquarters was tense with talk of retribution and gasps of ‘Murder!’ Angry strikers drove all police from the vicinity of the strike-headquarters, and pickets assumed the responsibility of directing the increasingly heavy traffic in and out of the building. 35 structural-iron workers, armed with lengths of lead-piping, came to the converted garage determined to defend it against attack. Hundreds of other workers pledged to spend the night with the strike-leaders and the wounded, committed to stand guard against any assault. As people from various walks of life came to the headquarters with cookies, fruit, and reading material for the wounded, militant workers talked of arming themselves and settling scores. The Organizer, its headlines screaming ‘Workers Blood is Shed!’, denounced the police in bold print: ‘Johannes The Butcher Uses Shotguns to Mow Down 48 Unarmed Workingmen’. Attacking the police as ‘the Uniformed Protectors of Profits’, the strike-bulletin deplored the provocation of Friday, 20 July 1934, as nothing less than ‘A cunningly conceived, diabolically planned and cold-bloodedly executed massacre’.
The full document is included here as a bonus resource; it was found on the libcom.org.