1935-61 - Fellowship controversy
The Wisconsin Synod and its seminary became involved in the Intersynodical Controversy when the Missouri Synod began to pursue fellowship ties especially with the American Lutheran Church. Some Missouri Synod theologians also began using a historical-critical method of theology that did not assume the Scriptures to be truly inspired or inerrant. The controversy ended with the Wisconsin Synod suspending fellowship with the Missouri Synod in August 1961.

