Sentence:  My heart wells up in admiration of the man, as I think of his participation in the memorable struggle of Homestead. He fought the <WSD>Pinkertons</WSD>, the myrmidons of Capital. 
Meaning of the word marked with <WSD> tags:  An operative employed by the (Pinkerton National Detective Agency) founded by (Allan Pinkerton) (1819-1884).