I have checked ezinearticles policy - they are ok, so long as I can prove that I am the original author. I've also checked Google Webmaster Guidelines which says 'Duplicate content on a site is not grounds for action on that site unless it appears that the intent of the duplicate content is to be deceptive and manipulate search engine results.' I'm not sure what HubPages policy is on republishing stuff elsewhere.
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You can do this if you remove the article from HP first. You might want to do that with hubs that have become idle, for instance. I know of people who have moved articles that weren't doing so well on HP onto other sites where the results were better