This JavaScript removes a specified set of Facebook group members. Tested with Google Chrome on 10/10/2014. PLEASE READ the Usage section in the file. Known issues: 1) When Facebook responds slowly, the script might experience hickups 2) Occasionally, the error 'this user is not a member of the group' pops up.

facebook-auto-delete-set-of-group-members.js

/* Slightly customized version of https://gist.github.com/michaelv/11145168
Usage:
1. Put the IDs you want to remove in the globalToBeRemoved array, and make sure
	 they are strings
2. Go to the group's members page (https://www.facebook.com/groups/GID/members/)
3. Paste the code (after adding the IDs to globalToBeRemoved) In the Javascript
   console, and then wait until the work is done. It takes a reasonable time.
*/

var globalToBeRemoved = ["10000152515xxxx","10000152515xxxx"];

var deleteAllGroupMembers = (function () {
  var deleteAllGroupMembers = {};
  var toBeRemoved = globalToBeRemoved;
  var usersToDeleteQueue = [];
  var scriptEnabled = false;
  var processing = false;
 
  deleteAllGroupMembers.start = function() {
    scriptEnabled = true;
    deleteAll();
  };
  deleteAllGroupMembers.stop = function() {
    scriptEnabled = false;
  };
 
  function deleteAll() {
    if (scriptEnabled) {
      queueMembersToDelete();
      processQueue();
    }
  }
 
  function queueMembersToDelete() {
    var adminActions = document.getElementsByClassName('adminActions');
    for(var i=0; i<adminActions.length; i++) {
      var gearWheelIconDiv = adminActions[i];
      var fbMemberId = gearWheelIconDiv.parentNode.parentNode.id.replace('member_','');
 
      if (toBeRemoved.indexOf(fbMemberId) != -1) {
        usersToDeleteQueue.push({'memberId': fbMemberId, 'gearWheelIconDiv': gearWheelIconDiv});
      } else { continue; }
    }
  }

  function processQueue() {
    if (!scriptEnabled) { return; }
    if (usersToDeleteQueue.length > 0) {
      removeNext();
       setTimeout(function(){
        processQueue();
      },1000);
    } else {
      getMore();
    }
  }
 
  function removeNext() {
    if (!scriptEnabled) { return; }
    if (usersToDeleteQueue.length > 0) {
      var nextElement = usersToDeleteQueue.pop();
      removeMember(nextElement.memberId, nextElement.gearWheelIconDiv);
    }
  }
 
  function removeMember(memberId, gearWheelIconDiv) {
    if (processing) { return; }
    var gearWheelHref = gearWheelIconDiv.getElementsByTagName('a')[0];
    gearWheelHref.click();
    processing = true;
    setTimeout(function() {
      var popupRef = gearWheelHref.id;
      var popupDiv = getElementByAttribute('data-ownerid',popupRef);
      var popupLinks = popupDiv.getElementsByTagName('a');
      for(var j=0; j<popupLinks.length; j++) {
        if (popupLinks[j].getAttribute('href').indexOf('remove.php') !== -1) {
          // this is the remove link
          popupLinks[j].click();
          setTimeout(function(){
            var confirmButton = document.getElementsByClassName('layerConfirm uiOverlayButton selected')[0];
            var errorDialog = getElementByAttribute('data-reactid','.4.0');
            if (confirmButton != null) {
              if (canClick(confirmButton)) {
                confirmButton.click();
              } else {
                console.log('This should not happen memberid: '+memberId);
                console.log(gearWheelIconDiv);
              }
            }
            if (errorDialog != null) {
              console.log("Error while removing member "+memberId);
              errorDialog.getElementsByClassName('selected  layerCancel autofocus')[0].click();
            } 
            processing = false;
          },700);
          continue;
        }
      }
    },500);
  }
 
  function canClick(el) {
    return (typeof el != 'undefined') && (typeof el.click != 'undefined');
  }

  function getMore() {
    processing = true;
    more = document.getElementsByClassName("pam uiBoxLightblue  uiMorePagerPrimary");
    if (typeof more != 'undefined' && canClick(more[0])) {
      more[0].click();
      setTimeout(function(){
        deleteAll();
        processing = false;
       }, 2000);
    } else {
      deleteAllGroupMembers.stop();
    }
  }

  function getElementByAttribute(attr, value, root) {
    root = root || document.body;
    if(root.hasAttribute(attr) && root.getAttribute(attr) == value) {
      return root;
    }
    var children = root.children,
      element;
    for(var i = children.length; i--; ) {
      element = getElementByAttribute(attr, value, children[i]);
      if(element) {
        return element;
      }
    }
    return null;
  }
  return deleteAllGroupMembers;
})();
deleteAllGroupMembers.start();
 
// stop the script by entering this in the console: deleteAllGroupMembers.stop();

May you please make a version for "http://touch.facebook.com" ? I think will be a lot faster. Thank you very much!