What's the difference between the Serpent Squad and Serpent Society?
(Newspaper photo of the Serpent Society from a recent job, from L-R: Black Racer, Puff Adder, Viper, Princess Python, Boomslang, Cobra, Cottonmouth, Bushmaster, Asp, Coachwhip, Diamondback, Anaconda.)
The original organization known as the Serpent Squad was formed by a pair of criminal brothers: Captain America foe Jordan Dixon (ne Stryke), alias the Viper, and Leopold Stryke, aka the Eel, as well as Klaus Voorhees, alias the Cobra, a foe of Thor's. They had an amazing master plan to... ruin Captain America's reputation via false advertising.
Anyway, Cap and the Falcon put them away and that was that.
At least, it was until the better-known Viper, the international, HYDRA-affiliated terrorist born Ophelia Sarkissian, killed Dixon and took over the Squad, adding Circus of Crime member (yes, that's a thing) Princess Python to their number.
Cap beat them. Again. But that didn't stop them.
Because everyone's favorite criminal oil company, Roxxon, put together a team that became embroiled in what is now known as the "Serpent Crown Affair." This team consisted of four new members: Blanche Sitznski (Anaconda), Tanya Sealey (Black Mamba), Roland Burroughs (Death Adder), and most crucially, a man named Seth Voelker (Sidewinder).
(photo of Seth Voelker as Sidewinder from a recent confrontation with the Avengers)
Seth Voelker is one of the few supervillains who has earned our respect because of his sheer business acumen. After his mission for Roxxon, Voelker decided to look higher in scope. To quote one Miles O'Brien:
(screencap of Miles O'Brien from Star Trek: Deep Space Nine, with the subtitle "He was more than a hero. He was a union man.")
Sidewinder formed an organization that was the first of its kind: a union for supervillains. Specifically, snake-themed supervillains. He recruited a dozen of his fellows and assembled them together, introducing his concept: mutual aid for herpetological horrors.
Not only would all Serpent Society members get a guaranteed minimum payout from any job they pulled as well as a generous benefits package, Sidewinder would personally liberate them from jail using his teleportation cloak.
Their first major job led to them killing George Tarleton, the Advanced Idea Mechanics leader known as MODOK, which drew both the attention of the rest of the underworld and of Captain America. This would be both a major factor in their success and in Voelker's undoing.
Because this attention attracted Captain America and his allies - including one of their own number, Rachel Leighton (Diamondback), who had begun to fall in love with Cap. And it also caught the Viper's eye. Sarkissian infiltrated the Society with a handful of her own loyalists, persuaded others to her side, and deposed Sidewinder as the group's leader.
And then, she poisoned Washington DC's water supply in order to turn the president and everyone else there into snake-people. Subtlety, thy name is not Ophelia Sarkissian.
Anyway, Captain America took her down, and Klaus Voorhees, now King Cobra, replaced her as Society leader. Some time later, the original Viper returned and rebranded the organization as "Serpent Solutions", which opposed Sam Wilson as Captain America, and as of late opposed the Avengers Emergency Response Squad with more than twenty snake-themed villains now part of their ranks.
Where they keep finding them, I'll never know.