Unionized UPS workers may go on a massive strike for the first time since 1997. The potential work stoppage could halt e-commerce movements — and it shows something deeper about how supply chain workers are treated today. Insider senior transportation Emma Cosgrove breaks down the big picture in the UPS-Teamsters showdown. (This episode was recorded on May 10)Follow the MODES PodcastOther FreightWaves ShowsLearn more about your ad choices. Visit megaphone.fm/adchoices