A quick glance through those Wikipedia pages that exist for strikes and even "labor wars" quickly confirm these numbers.
One example for such wars would be the Illinois coal wars with around 24 deaths.
During the Copper Country Strike of 1913–1914, a number of above 83 people from the 'labor' side died.
Another of these wars even featured machine guns and high powered rifles, West Virginia coal wars. Given that initial number and quality of arms involved it is quite surprising that the pivotal battles at Matewan and Blair Mountain only cost the number of 50–100 deaths on the side of labor, with 985 people arrested. Nevertheless Wikipedia calls this confrontation the largest insurrection in the United States since the Civil War.
Although the claim to investigate here is quite vague. "Facing death" is quite easily true if police, strike breakers, mobs, and 'the' mob (mafia), Pinkertons or National Guard just start shooting crowds.
Counting exact numbers for killed might be easier in cases like in the Cotton Picker's Strike 1891 where
The strikers had been trying to work north, back to President's Island and then to Memphis. In an open battle the posse killed two strikers and captured nine. At more or less the same time, Patterson alone escaped to the steamboat James Lee and admitted his story, but was extracted from the boat, taken ashore, and shot. The nine prisoners under guard by the sheriff's men were intercepted on the road by a masked lynching party, greatly outnumbering them, that took the prisoners and hung them one by one.
The Pullman Strike 1894 had 30 deaths and 51 injuries.
In just one of dozens of Streetcar Strikes, which
From 1895 to 1929, streetcar strikes affected almost every major city in the United States. Sometimes lasting only a few days, these strikes were often "marked by almost continuous and often spectacular violent conflict," at times amounting to prolonged riots and weeks of civil insurrection.
The one in San Francisco 1907 stands out a bit with 31 confirmed deaths and 1000 inhuries.
The Lattimer massacre was the violent deaths of at least 19 unarmed striking immigrant anthracite miners at the Lattimer mine near Hazleton, Pennsylvania, on September 10, 1897.
An 'facing death' is certainly part of the show if in an aftermath of such confrontation you get 'military rule' with locked and loaded rifles the feature fixed bayonets and a ready to deliver lead with a frickin gatling gun. (Colorado Labor Wars 1903–1904).
A quick listing though a small collection found on Wikipedia's List of worker deaths in United States labor disputes gets into the 'hundreds killed' figure quickly. It lists 898 deaths from direct conflict with "Law enforcement and companies' militia, armed detectives and guards", 25 cases of capital punishment and 327 deaths caused by "vigilante, strikers, mob and hate group".
That list is quite incomplete of course. An alledgedly first comprehensive statistics attempt – albeit more like conservatively establishing a lower limit – is here:
Sometimes violent contention becomes fatal; blood is spilled and people killed in the course of the struggle. In the United States from 1877 through 1947, there were no less than 270 strikes wherein at least one person was killed. The earliest recorded US strike occurred in 1775 when New York printers struck for higher wages, and won. Yet by all indications the first strike to become lethal did not take place until 1850, when two striking tailors were killed by police. However, between the 1870s and the late 1940s, a whole new "cultural epoch of contention" was opened between capital and labor, one in which lethal industrial violence was relatively common.
— Paul F. Lipold & Larry W. Isaac: "Striking Deaths: Lethal Contestation and the ‘‘Exceptional’’ Character of the American Labor Movement, 1870–1970", IRSH 54 (2009), pp. 167–205 doi:10.1017/S0020859009000674 – 2009 – Internationaal Instituut voor Sociale Geschiedenis. (PDF)