The Wagner Group is allegedly like Blackwater, but it’s really just ruse for deniability (i.e. “the RF isn’t involved because the Wagner Group is a private company”). The Wagner group is controlled by the RF Defense Ministry. They aren’t “Neonazis”.
Except that the Wagner Group's founder, Dmitry Utkin, is covered in Nazi tattoos, Comrade Achilles.
"Wagner" was Utkin's GRU call sign.