var groupStartsWith = 'CTS STC';

var gr0 = new GlideRecord('sys_user_group');
gr0.addQuery('name','STARTSWITH',groupStartsWith);
gr0.query();
while ( gr0.next() ) {
 gs.log("group name: "+ gr0.name);

 var groupName=gr0.name;
 // set groupName to the group where you want to synchronize team leads to be the same
 // as the set of all members of the group
 // this is especially useful for CTS STC groups
 var gr1 = new GlideRecord('sys_user_group');
 gr1.addQuery('name',groupName);
 gr1.query();
 while ( gr1.next() ) {
  gs.log("group name: "+ gr1.name + " and group full name: " + gr1.u_full_name + " and sys_id: " +  gr1.sys_id);
  gs.log("ORIGINAL group u_team_leads: " + gr1.u_team_leads);

  var leadsString='';
  var gr2 = new GlideRecord('sys_user_grmember');
  gr2.addQuery('group',gr1.sys_id);
  gr2.query();
  while ( gr2.next() ) {
 //  gs.log("user sys_id is: " + gr2.user);
   if ( leadsString.length > 0 ) {
    leadsString+=',';
   }
   leadsString+=gr2.user;
  }
  gs.log("PROPOSED group leads: " + leadsString);
 
  var gr3 = new GlideRecord('sys_user_group');
  gr3.addQuery('name',groupName);
  gr3.query();
  while (gr3.next()){
   gr3.u_team_leads = leadsString;
   gr3.update();
  }

  var gr4 = new GlideRecord('sys_user_group');
  gr4.addQuery('name',groupName);
  gr4.query();
  while (gr4.next()){
   gs.log("UPDATED group u_team_leads: " + gr4.u_team_leads);
  }
 }
}