How to moderate subscribers in Joomla?

HI I need a simple component which will allow me to moderate new users

in other words, once a user has registered to the site, I don't want his/her account to be activated until the admin authorizes/enables it.

I have used Community Builder for this on a site which I am revamping. CB is overkill as this is the ONLY feature I'm using.

How can I accomplish this simply?

Thanks!

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