What is the effect of a ban on providing "expert advice or assistance" to a designated foreign terrorist organization?

On August 27, 2003, Plaintiffs filed a separate complaint in the district court (CV-03-06107-ABC; appeal No. 05-56846), challenging AEDPA's ban on providing "expert advice or assistance" to a designated foreign terrorist organization. The district court found that term to be unconstitutionally vague, but not overbroad. See Humanitarian Law Project v. Ashcroft, 309 F.Supp.2d 1185 (C.D.Cal. 2004). The district court granted Plaintiffs's request for injunctive relief. See id. at 1204. Both parties appealed.