void stopWithTag(Object tag)

Stops all actions with the specified tag and removes them from the controller.

myNode.actions.stopWithTag("myActionGroup");

Source

void stopWithTag(Object tag) {
  for (int i = _actions.length - 1; i >= 0; i--) {
    Action action = _actions[i];
    if (action._tag == tag) {
      _stopAtIndex(i);
    }
  }
}