Another pastor at the 1957 WELS convention resigned over the Synod's rejection of Committee No. 2 (Church Union) report.
Pastor M. J. Witt and his church, Trinity Lutheran Church of Spokane, Washington, had been protesting members of the Wisconsin Synod since either 1953 or 1955. The reason for the unknown date is because his letter says, "Since the 1953 convention at Saginaw...". The 1953 convention was in Watertown, Wisconsin, and the 1955 convention was in Saginaw, Michigan.
Either way, here is his resignation letter.