How can I disable ALL the enemies in the scene?

As the title says, are there any ways for me to disable all the enemies in the scene from a script? There is no way for me to get component from GameObject.FindGameObjectsWithTag()

make a static var something like this

static var enemiesON : boolean = true;

when you want to disable them do this:

//this is an exemple
if (Input.Getkey(KeyCode.A))

enemiesON = false