AT&T on Friday said it had sued eight times in federal court to stop an arbitration-based campaign to try and halt the buyout of T-Mobile. The suits, filed in each of the areas where Bursor and Fisher was launching its efforts, allege that the attempts violate the terms of AT&T's arbitration cases. Although individuals are making arbitration cases, they're demanding penalties that would apply to a class action and are supposedly violating terms that bar making more than individual claims.