Some workers at a food distribution company petitioned the NLRB for a vote to certify the Teamsters representation at their job. Seems it was turned down.
The reason and the full story is contained in the link.

Meridian workers tried to oust Teamsters union. Government said no. Here’s what happened
A delivery driver for a wholesale food company with a Meridian office is challenging a National Labor Relations Board ruling that prevents employees from voting on whether to continue to have a labor union represent them.
Curtis Thomason, a driver for Shamrock Foods, filed an appeal after Paula Sawyer, the NLRB’s regional director in Denver, dismissed a petition filed by Thomason and most of his 34 co-workers seeking to decertify Teamsters Local 483. Thomason is seeking review by the full NLRB in Washington, D.C.
Neither Thomason’s petition, nor a separate appeal filed by Shamrock Foods, says why the workers seek to decertify the union.
Under President Donald Trump, the NLRB has issued a number of decisions making it harder for workers to unionize and easier to remove existing unions from a workplace. All three members of the present board are Republicans.
Thomason is represented by the National Right to Work Legal Defense Foundation, a conservative group that backs challenges against unions and lobbies for pro-business labor practices.