[wsj-responsive-image P="https://si.wsj.net/public/resources/images/MI-CO864_ROLLOV_P_20160327154437.jpg" J="https://si.wsj.net/public/resources/images/MI-CO864_ROLLOV_P_20160327154437.jpg" M="https://si.wsj.net/public/resources/images/MI-CO864_ROLLOV_P_20160327154437.jpg" caption="" credit="Bloomberg" placement="Header" suppressEnlarge="true" ignorerespwidth="749" ignorerespheight="499" ][wsj-responsive-image P="https://si.wsj.net/public/resources/images/MI-CO864_ROLLOV_P_20160327154437.jpg" J="https://si.wsj.net/public/resources/images/MI-CO864_ROLLOV_P_20160327154437.jpg" M="https://si.wsj.net/public/resources/images/MI-CO864_ROLLOV_P_20160327154437.jpg" caption="" credit="Bloomberg News" placement="Header" suppressEnlarge="false" ignorerespwidth="749" ignorerespheight="499" ]A new Labor Department rule that will give unions more knowledge of the discussions employers have with advisers who help counter collective-bargaining and union-organizing campaigns has triggered its first lawsuit. The National Association of […]