Fritz Von Erich
Sieber debuted at the age of 17 under the ring name "Waldo Von Sieber". He began his career in Calgary, wrestling for Stu Hart's Stampede Wrestling promotion using the character of an evil German. In the late-1950s, Hart paired Sieber with Fritz Von Erich, who also portrayed a villainous German. With Sieber changing his ring name to "Waldo Von Erich", the duo billed themselves as brothers and formed a tag team.