How many coal miners went on strike in Pennsylvania in 1902?
According to USDL (2017), total number of workers involved in strike was 147000.
"The miners struck on May 12, 1902. There was hope for a settlement as long as firemen, engineers, and pumpmen remained at work. But when these maintenance crews walked out on June 2, both sides settled down for a long and bitter fight. Commissioner of Labor Carroll D. Wright wrote that of 147,000 strikers, 30,000 soon left the region, and of these 8,000 to 10,000 returned to Europe. Although Mitchell exhorted the miners to strike peaceably, strikers attacked scabs, terrorized their families, and lashed out at private police forces and armed guards hired by mine owners "
US Department of Labor (2017). www(dot)dol(dot)gov(slash)oasam(slash)programs(slash)history(slash)coalstrike(dot)htm.