Establish this as a gameObject to destroy

I have a series of game objects that are all the same prefab, same tag, and their only distinguishing feature is a public string called “label”. They all share a controller script in C#.

When my player executes an action, I want the game object its colliding with currently to disappear and trigger a series of events.

How can I use the controller script to establish the game object currently being collided with to ultimately use Destroy() upon?

So you want to check if the colliding object contains the script to establish it as a candidate for destruction. In simple words, if the guy has the script, destroy it.

void OnCollisionEnter(Collision col){
    if(col.gameObject.GetComponent<Controller>() != null){
        Destroy(col.gameObject);
    }
}

in UnityScript:

function OnCollisionEnter(col:Collision){
    if(col.gameObject.GetComponent(Controller) != null){
        Destroy(col.gameObject);
    }
}