Women's Flat Track Derby Association a 501(c)(3)…..here are their 990 tax returns where it is designated…good post, BlueCat…..http://www.guidestar.org/FinDocuments/2011/320/328/2011-320328905-08ce0182-9.pdfOops, I found one. The Women's Flat Track Derby Association says it's a 501(C)6 on it's Facebook page. However, it claims it is a 501(c)3 on it's main web site. Not sure which is correct. They may want to check that out - some people frown on misrepresenting your 501 C status.