Sounds a little problematic depending on the details. If the text was released on Wikipedia first, then the contributors agreed "to release your contribution under the CC-BY-SA 3.0 License". If the all the authors of the article can identify themselves as the same people who contributed under the named accounts for the original Wikipedia article then release to PD is no problem, in practice few articles only have a history of contributors who are using accounts associated with their legal identities.
Cheers, Fae -- http://enwp.org/user_talk:fae Guide to email tags: http://j.mp/faetags