mass resignation
... that four months after a mass resignation, which caused a loss of 22 jobs, Major League Baseball umpires voted to form a new union?
... that four months after a <b id="mwCnA"><a href="./1999_Major_League_Umpires_Association_mass_resignation" id="mwCnE" rel="mw:WikiLink" title="1999 Major League Umpires Association mass resignation">mass resignation</a></b>, which caused a loss of 22 jobs, <a href="./Major_League_Baseball" id="mwCnI" rel="mw:WikiLink" title="Major League Baseball">Major League Baseball</a> <a href="./Umpire_(baseball)" id="mwCnM" rel="mw:WikiLink" title="Umpire (baseball)">umpires</a> voted to form a new union?