There's an interesting note in the November 29, 1870 issue of The New York Times about the Union Base Ball Club of St. Louis. The Times writes that "(the) Union Amateur Club, of St. Louis, has disbanded. Its social status was too high for Sunday playing, which is in vogue in St. Louis."
Al Spink writes in The National Game that "(in) the early (1860's) the Union...came into the field. The Union had for their playing team Charles H. Turner, catcher; R.J. Lucas, pitcher; Henry Carr and Henry Berning, first base; E.C. Meacham, second base; Charles Cabanne, third base; Eugene Greenleaf, shortstop; Asa Smith, left field; Walter Wolf, center field, and Archie Easton, right field."
"It will be noticed by the above list," Spink writes, "that the Union team was made up of the silk stocking element of that day and the name Union was taken because the players of the teams were all men who had stood by the Union during the Civil War. Their very name at that time aroused feeling and animosity and added to the rivalry that already existed between the then leading local baseball teams."