NBC News is reporting that yesterday evening, UFCW 3000—the Washington state local of the United Food and Commercial Workers—officially endorsed an uncommitted vote in the upcoming presidential primary.
Although there's not much to work with here—it doesn't appear the union has yet publicized the full statement they'll make on this—NBC News quotes the union as saying in part:
Currently, many voters, and UFCW 3000 executive board, feel that the best path to have the best nominee, and to defeat Trump, is to vote “uncommitted.” The hope is that this will strengthen the Democratic party’s ultimate nominee to defeat Trump in the General Election in November. We need a nominee who can run and beat Trump to protect workers across this country and around the world.
Nonetheless, the statement also appears to rule out further abstention by the union. NBC says that this statement includes a commitment during the general election to “sending staff, members, and resources to any swing state across the nation to support the Democratic nominee to win and defeat Trump.”