Neat Unity3D editor script for grouping objects in hierarchy

HierarchyHelper.cs

using System.Collections.Generic;
using System.Linq;
using UnityEditor;
using UnityEngine;

// Neat editor script for grouping objects in hierarchy by /u/SocialOfficer
// 
public class HierarchyHelper
{
    public static string Suffix = "_Root";

    [MenuItem("GameObject/Organize/Merge in new or existing parent", false, -10)]
    public static void Merge()
    {
        var selection = Selection.objects.ToList();
        var first = Selection.activeGameObject;

        string baseName = first.name;
        string rootName = baseName + Suffix;

        GameObject newRootParentObject;
        var existingRoot = GameObject.Find(rootName);

        if (existingRoot != null)
        {
            newRootParentObject = existingRoot;
        }
        else
        {
            newRootParentObject = new GameObject();
            newRootParentObject.name = baseName + Suffix;
            newRootParentObject.transform.SetParent(first.transform.parent);
        }

        foreach(var item in selection)
        {
            var gameObject = item as GameObject;
            gameObject.name = baseName;

            gameObject.transform.SetParent(newRootParentObject.transform);
        }
    }

    [MenuItem("GameObject/Organize/Dissolve root container", false, -10)]
    public static void DissolveParent()
    {
        var selection = Selection.activeGameObject;
        if (selection.name.EndsWith(Suffix))
        {
            List<GameObject> childObjects = new List<GameObject>();
            foreach(Transform child in selection.transform)
                childObjects.Add(child.gameObject);

            foreach(var gameObject in childObjects)
            {
                gameObject.transform.SetParent(selection.transform.parent);
            }

            GameObject.DestroyImmediate(selection);
        }
        else
        {
            Debug.LogError("Selected GameObject is not a valid root parent.");
        }
    }
}

lol