The production company I.M.P. on Wednesday told door staff, bartenders, food vendors and other hospitality workers at three major D.C. venues — 9:30 Club, the Atlantis and Lincoln Theatre — that it would recognize their efforts to unionize with Unite Here Local 25, as labor organizing efforts among other workers continue across the company’s locations. Subscribe for unlimited access to The Post You can cancel anytime. Subscribe

“While we know working with a union will fundamentally change our relationship with our bartenders, service and event staff, we understand that a majority of U Street venue employees have expressed their desire for union representation,” I.M.P. Chief Operating Officer Donna Westmoreland wrote in a memo to staff at the venues. “As such, we have agreed to voluntar

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