A Charleston man has pleaded guilty in what authorities are calling one of the largest child pornography cases in the nation.

Christopher Blackford, 28, pleaded guilty last Thursday in the Western District of Louisiana to participating in a child exploitation enterprise. He faces 20 years to life in prison, according to officials with the Immigration and Customs Enforcement’s Agency, who conducted the investigation.

According to court documents, Blackford admitted he participated in an international criminal network known as Dreamboard, which produced and disseminated photos of graphic child sex abuse on the Internet.

Blackford joined Dreamboard in December 2009 and contributed 84 posts to the online bulletin board that contained child pornography, according to federal authorities.

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Reach Natalie Caula at 937-5594 or Twitter.com/ncaula.