Salem/Affiliation

Humanity
Salem's goal appears to be the destruction of humanity and all of its creations. However, she possesses a healthy respect for their resourcefulness and ingenuity, and knows that humans are able to derive strength from hope.

However, by dividing them and snuffing out their source of hope, she believes that she can rob humanity of their strength and thus destroy them.

Ozpin's Group
Ozpin's group, consisting of at least Ozpin, Qrow Branwen, Glynda Goodwitch, and James Ironwood are all aware of Salem's existence and that she is a threat to all of Remnant.

Cinder's Faction
Cinder's Faction is working under Salem. Emerald and Mercury are brought with Cinder back to Salem after her injury, while Roman Torchwick referred to being employed by people he couldn't stop.

Ozpin
Salem has a mysterious link with her enemy, Ozpin. They have apparently been locked in a struggle over the fate of humanity for a long time, with Salem attempting to destroy humans and Ozpin defending them.

However, she is heard calmly and respectfully conversing with Ozpin in the episode "Ruby Rose". Ultimately, however, in "End of the Beginning", Salem affirms that she intends to watch Ozpin burn, but only after she destroys everything he has built.

Judging from comments made by Cinder Fall during the events of "Heroes and Monsters", Salem deems Ozpin exceedingly arrogant.

Qrow Branwen
Qrow has personally seen some of Salem's creations and stated that "they are fear".

Cinder Fall
Salem holds Cinder in high regard due to her Fall Maiden status, her success with destroying Beacon Academy, and her understanding that Cinder killed Ozpin. Salem does however refer to her as "young Cinder," which adds a note of condescension in their relationship.

Tyrian
Salem trusts Tyrian enough to hunt Maidens and Ruby Rose.

Ruby Rose
Although neither have met, Salem is aware of Ruby and her abilities, and she plans to crush her.