Get variable from Script in list and , set direct link to other script

Hello, trying to get value of variable in Script from List, and if its False, i need put direct link on this Script in other script... but i doing something wrong and cant get a value.

 using System.Collections.Generic;
 using UnityEngine;
 
 public class ListHolder : MonoBehaviour
 {
     public List<MonoBehaviour> muIsBusy = new List<MonoBehaviour>();
 
     private void Update()
     {
         AddMUInTheList();
     }
 
     void AddMUInTheList() 
     {
         if (GameObject.FindObjectOfType<MU>() != null)
         {
             if (!muIsBusy.Contains(GameObject.FindObjectOfType<MU>())) muIsBusy.Add(GameObject.FindObjectOfType<MU>());
 
             foreach (var scriptableThing in muIsBusy)
             {
                 if (scriptableThing != null & scriptableThing.muBusy == false)
                 {
                     //set link to onher script
                 }
             }
         }
 
     }
     
 }

Here the scipt which variable i need:

 using UnityEngine;
 
 public class MU : MonoBehaviour
 {
     public static bool muBusy = false;
     public int random;
     public void Start()
     {
         random = Random.Range(0, 2);
 
         if (random != 0)
         {
             muBusy = true;
         }
     }
 }