Private posts in WordPress

Does anyone know if it is possible to make certain posts only viewable to people who have registered on a WordPress blog?  I am working on a blog for an organisation and we would like to be able to use one blog and just have certain posts only made visible to members of the organisation who would register on the site.

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Paul
Enthusiast, marketing strategist, writer, and photographer. Passionate about my wife, Gina and #proudDad. Allergic to stupid

What do you think?

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