Shadow Minds

The shadow Minds were an elite organisation created when Shockwave, Grand Admiral Thrawn and Supreme Leader Snoke all teamed up and united their forces. Snoke came alon from his own timeline where he had been "killed". Thrawn came with his remaining supporters and Shockwave bought the decepticons after he overthrew Darth Megatron.

History
Shockwave grew tired of Darth Megatrons planing failures and challenged him to a battle for leadership of the Decepticons. Shockwave won and Megatron was exiled with his boyfriend Starscream. Shockwave kicked out some slackers like Thundercracker before he met Snoke.

Snoke had been "killed" in his own timeline by his apprentice Kylo Ren but seemed immortal in real life, just like Shockwave. Snoke joined forces with Shockwave and the Decepticons. Later, the pair found the clone of Grand Admiral Thrawn, who was in hiding after his original body had died. The Clone retained everything about the original from memoreys to tactics. Thrawn joied them with his remaining supporters and the trio formed the Shadow Minds.