The law of offices of Charles J. Piven, P.A. announced on Friday that it had filed four class actions, all alleging violations of federal securities law through materially false and misleading statements having the effect of artificially inflating the market price of the companies' securities. The action agains Blockbuster, Viacom, and its controlling shareholder was filed in U.S. District Court for the Northern District of Texas. The action agains Helen of Troy, Ltd. was filed in U.S. District Court for the Western District of Texas. The action against Universal American Financial Corp. was filed in U.S. District Court for the Southern District of New York. The action against Great Wolf Resorts, Inc. was filed in U.S. District Court for the Western District of Wisconsin. Great Wolf Resorts also faces similar class actions filed by Scott + Scott LLP and by Millberg Weiss.