By this article on Blair Mountain, 10,000 miners marched, and 16 died.
According to [1], in the Pullman Strike, about 70 were killed nationwide, 250,000 workers in 27 states were involved, and the President called out the Army.
Personal disclosure: I grew up about 2 miles from Pullman, not that that gives me any special insight.
It might be good to adjust that expectation.
The Smithsonian's interest in these flights was political. The reputation of the Smithsonian had suffered greatly in 1903 when Langley's Aerodrome failed to fly. This made it more difficult to obtain funding, which limited its growth and effectiveness as a scientific organization. The current Secretary, Charles Walcott, felt that the best way to repair this reputation was the show the Aerodrome could have flown; the time and money spent on it had not been wasted.
https://www.wright-brothers.org/History_Wing/History_of_the_...
The original title, and the title still on the article, is "What Made the Battle of Blair Mountain the Largest Labor Uprising in American History?"
Since you would expect the Smithsonian to have a good grasp of history, a charitable reading would imagine a reason that they would say "largest" even though they could certainly do the math to compare 10,000 to 250,000.
Could, but didn't.
The headline isn't "Largest Labor March". It's "Largest Labor Uprising".
Why are you trying to defend an obvious mistake? Is that where you work or something?
Such deep cynicism is really an awful thing to see.
https://en.wikipedia.org/wiki/Battle_of_Blair_Mountain
It was the deadliest by this list:
https://en.wikipedia.org/wiki/List_of_worker_deaths_in_Unite...
However, you're right that Blair Mountain does appear to have had more armed conflict, although River Rouge had more people involved, as did the Pullman Strike. There were just more people in the industrialized North than in Appalachia.
Why bother arguing about this? I'm really tired of things being called "the biggest [or worst] in history" when the real meaning is "biggest I can think of, off the top of my head."
[1] https://speakoutsocialists.org/the-strike-at-river-rouge-det...