Herb Pennock
... that Baseball Hall of Fame manager Connie Mack said that selling Herb Pennock was his greatest mistake?
... that <a href="./National_Baseball_Hall_of_Fame_and_Museum" id="mwDOg" rel="mw:WikiLink" title="National Baseball Hall of Fame and Museum">Baseball Hall of Fame</a> <a href="./Manager_(baseball)" id="mwDOk" rel="mw:WikiLink" title="Manager (baseball)">manager</a> <a href="./Connie_Mack" id="mwDOo" rel="mw:WikiLink" title="Connie Mack">Connie Mack</a> said that selling <b id="mwDOs"><a href="./Herb_Pennock" id="mwDOw" rel="mw:WikiLink" title="Herb Pennock">Herb Pennock</a></b> was his greatest mistake?