Much like The Wolves from Season 6, The Whisperers completely abandoned their lives from the pre-apocalypse, and live a violent cult-focused life led by an unnamed Alpha leader.
The Whisperers are an especially terrifying threat in the Walking Dead comic book series.
Instead, they reserve their violence for the living, and are known to be a threat both physically and emotionally.
They don’t believe in killing the undead- living peacefully among them through their disguises.