rogue

obsolete The leader of a male band of thieves or gypsies. While one should be wary of the traveling group, the arch rogue who orchestrates them is especially dangerous.

A police collection of pictures of criminals and suspects kept for identification purposes. For example, The detective went through the entire rogues' gallery but couldn't find a match with the suspect . [Mid-1800s]

Collection of “head shot” photographs. A rogues gallery is a compilation of “mug shot” photos of actual and suspected criminals maintained by police departments for purposes of identification. The practice began in the mid-19th century with the development of photography. By extension, any collection of head-and-shoulder photos, such as college fraternity composites and academic yearbooks, is jokingly referred to as rogues galleries.