Blizzard, this addon needs to go.
Completely breaks World PvP and the true Classic experience, and will support the whole “mafia” nonsense in Ungoro.
The addon scans the combat log for actions performed by enemy players. If an enemy player is detected the addon will attempt to determine their class, race and level based on the ability that was used. The addon will then sound an alert and add the enemy player to its list.
Spy can be configured to announce enemy player encounters to a chat channel and can also be configured to share data with other Spy users in your party, raid or guild. This allows a group of players to share information and determine the location of enemy players over a vast area.