Both Joe Biden and Kamala Harris have had strong labor union support, emphasized on Labor Day this past Monday.
Biden has had a strong record of support of organized labor, and walked the picket lines recently, which no earlier President has done.
Harris made clear his commitment to support of labor and its basic rights in campaign events, and already, both Biden and Harris have a record of stronger support than any President since Franklin D. Roosevelt, who promoted the National Labor Relations (Wagner Act) in 1935, and Harry Truman, who vetoed (unsuccessfully) the Taft Hartley Act of 1947.