Employees at Con-way Freight's Harlingen, Texas, facility voted to reject representation by the Teamsters Union in Friday's election.

Since October, the union has won two organizing elections at Con-way Freight locations. Employees at the Laredo terminal became the first at the company to join the union, followed by those at the Con-way Freight Los Angeles facility.

The Harlingen election results mark the fourth defeat for the Teamsters Union this year in its efforts to organize workers at Con-way Freight. Previously, a majority of employees at Con-way Freight locations in Santa Fe Springs and San Fernando Valley, California, and Manchester, New Hampshirem voted against the union.

Last month, the union also withdrew a petition for election at Con-way Freight's facility in Irvine, California.

"Our employees continue to demonstrate that when they are able to consider all the facts, and have the opportunity to make an informed choice in a free and fair election, they vote to remain union-free," said Greg Lehmkuhl, Con-way Freight president, in a statement.

Despite the union winning organizing elections at two locations, Con-way Freight currently does not have a contract with the Teamsters at any of its nearly 300 locations in the U.S.

The votes are part of a recent campaign by the union to organize Con-way workers, including drivers, as well as at rival less-than-truckload carrier FedEx Freight, where the union has won three elections at various terminals and lost three others, while withdrawing voting at at least four others.