With the peak holiday shipping season kicking into high gear, the nation’s largest trade association for retailers on Monday urged negotiators for the International Longshoremen’s Association and their employers return to the bargaining table. Talks on a new master contract between the ILA and the U.S. Maritime Alliance (USMX), which represents employers, broke down last week, and Matthew Shay, president and chief executive officer of the National Retail Federation , said “now tha...