<p>During an annual week celebrating nurses across the U.S, nearly 3,000 nurses at Endeavor Health in the Chicago area are working to unionize over pay cuts and what they say are unsafe working conditions.</p><p>While the effort has been quietly building for about a year, now nurses are openly organizing at work and have launched a public campaign on Instagram under the name teamsternurses. That’s a nod to the Teamsters Local 743, the union that would represent them.</p><p>“Once upon a time the nurses of North Shore were HAPPY,” one post on Instagram reads. “It was not long ago they were even called HEROES.