Disable multiple game objects (Object Pooling)

Hello , I'm trying to disable some game objects that are spawned with the object pooling. The game objects that I want to disable are enemies, they must be disable when is active another game object that I have chosen.

I tried this but it does not work:

 using UnityEngine;
 using System.Collections;
 
 public class ifBossActive : MonoBehaviour {
 
     public GameObject boss;
     private GameObject[] enemies;
 
 
     void Start () {
         enemies = GameObject.FindGameObjectsWithTag ("Enemy");
     }
         
 
     void Update () {
         
         if (boss.activeInHierarchy) {
             for(int i = 0; i < enemies.Length; i++)
             {
                 enemies [i].SetActive (false);
             }
         }
 
     }
 }

This is the code for the object pooling (used for enemies):

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 
 public class enemiesGen : MonoBehaviour {
 
     public float spawnTime = 0.1f;
     public GameObject enemy;
 
     public int pooledAmount = 8;
     List<GameObject> enemies;
 
     void Start () {
         enemies = new List<GameObject> ();
         for (int i = 0; i < pooledAmount; i++)
         {
              GameObject obj = (GameObject)Instantiate(enemy);
             obj.SetActive (false);
             enemies.Add(obj);
         }
 
         InvokeRepeating ("spawnEnemy", spawnTime, spawnTime);
     }
 
     void spawnEnemy () {
 
         for (int i = 0; i < enemies.Count; i++) {
 
             if (!enemies [i].activeInHierarchy) 
             {
                 transform.position = new Vector3 (transform.position.x, transform.position.y, transform.position.z + Random.Range(50f, 250f));
                 enemies [i].transform.position = transform.position;
                 enemies [i].transform.rotation = transform.rotation;
                 enemies [i].SetActive (true);
 
                 break;
             }
         }
     }
 }

How can I fix? Thanks in advance.