In the Naruto Shippuden Ending 32, Naruto, Sasuke, Kakashi and Sakura are fighting against some masked bad guys.
Who are those people?
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As I said in the comments, I have a theory about the identity of these bad guys.
Because this was an ending of a canon episode, I would say they didn't exist in the Naruto universe. But if we take a closer look they are wearing Konoha's clothes and ANBU's mask. So these bad guys, I think they are ANBU's ninjas (even though some times they don't wear these outfits) who are "chasing" Sasuke.
Anyone with more information, please don't hesitate to change this post. :)