In July, Bain Capital and THL Partners say, they received a misdirected e-mail from Credit Suisse about how the banks planned to renege on the lending agreement for the private-equity firms to buy Clear Channel Communications. On Wednesday, Bain and THL sued the bank consortium, including Citigroup, Credit Suisse, Morgan Stanley, Royal Bank of Scotland, Deutsche Bank and Wachovia, over the collapsed $19.5 billion takeover.

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