[CentOS] how to remove some packages with yum from a repo X????

Mon Jun 16 13:57:44 UTC 2008
Manuel Enrique Chavez Manzano <manny at cmc.cfg.sld.cu>

I have installed some packages from a Repo X, lets call it like that, so
now I need to unistall all those packages with yum 
is there a way to do that????
how?
-- 
"Nuestra recompensa se encuentra en el esfuerzo y no en el resultado.
Un esfuerzo total es una victoria completa".
                                              Mahatma Gandhi
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 (\o/)-----o00o(__)-o00o-----------(\o/)
 (/|\)Manuel Enrique Chávez Manzano(/|\)
   |     manuel864 at gmail.com         | 
   |     manny at cmc.cfg.sld.cu        |
   |      GNU/LINUX User             |
   |       #468073                   |
 (\o/) Using CentOS 5.1            (\o/)
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