What is "old german baptist brethren"

The Old German Baptist Brethren (OGBB) are a church, that emerged in 1881 from a division among the German Baptist Brethren. They are part of the post-reformation Anabaptists, which include, among others, the Amish and Mennonites, who rejected baptism of infants as a biblically valid form of baptism. They are one of several Brethren groups that trace their roots to 1708, when eight believers founded a new church in Schwarzenau Germany.