During his tenure on the War Labor Board, Feinsinger helped settle a number of important strikes. In November 1944, he settled a national strike by telephone switchboard operators belonging to the National Federation of Telephone Workers which had shut down telephone service in Washington, D.C., Detroit and other large cities. Feinsinger told the union leaders that they were defying the government of the United States and "no union has done that yet and succeeded." On November 24, telephone workers in Dayton ended their walk-out and the nationwide strike collapsed. President Roosevelt specifically praised Feinsinger for his role in ending the dispute.