They were, indeed, Giants in their field.
Only two schools in the history of the single-class Indiana high school basketball tournament won three consecutive state championships. There was the Franklin "Wonder Five" in 1920, '21 and '22, and the Marion Giants in 1985, '86 and '87. Such feats require a healthy mix of talented players and coaches. Some luck, too. And, oh yeah, a little bravado.
It's too late to go back and check for details with members of the Franklin High School teams led by future Naismith Hall of Famer Fuzzy Vandivier, but here's a story that summarizes the moxie of the Marion teams.