There’s a certain type of guy who just wants to put on a costume and belong to a group. This usually ends poorly.

the Narcotic Gang:

These fellows really know how to make heroin smuggling look grandiose, although the weird antennae-hoods really take the shine off of their cool double-breasted robes. Despite all the ceremony and cool rings and whatnot, they are brought to justice by reporter Red Logan without much trouble. (More Fun Comics 031, 1938)

the Night Raiders:

This masked cowboy gang battled it out with the Masked Ranger over a map to an Old West gold mine. I would describe them as broadly incompetent. (More Fun Comics 036, 1938)

the Mastermind:

“The Mastermind” is the name chosen by a crook who taunts the police with the threat that he will steal the Ranjoor Diamond from its owner Mr Harkness the next night. Sandy Kean and Larry Trent of the Radio Squad are on hand to foil the crime and quickly determine that Harkness and the Mastermind are one and the same, and that his motivation was the pure love of the cop-fooling game. (More Fun Comics 037, 1938)

the Hooded Riders:

Like the Night Raiders, the Hooded Riders are a classic Western-style masked gang, in this case one that is looking to take control of the ranching operations of a whole valley. Since this is a Constable O’Malley of the Red Coat Patrol story, this all takes place in the present (well, the past’s present, i.e. 1939) and in a geographically-ambiguous part of Canada. (More Fun Comics 045, 1939)