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

Mon Jun 16 14:03:16 UTC 2008
Tom Brown <tom at ng23.net>

> 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?
>   
>   

yum erase foo