Sitefinity: How do I get the title of a taxonomy "tag" when viewing the page filtered by that tag?

If I have clicked a link generated by a Tag widget in Sitefinity, I end up on a page with a URL like this:

/normal-url/-in-tags/tags/tag-name

If I have an MVC control on the /normal-url/ page, how can I pull the tag-name into a View or into the Controller?