What crime? In order to pin something on them, you have to have some idea of the law, and how they violated it. You can't sue because you don't like what they've done, or the results aren't what you wanted.
There may be a cause of action if they knowingly violated a law or fiduciary responsibility. Didn't they publish a 'poison pill', in conjunction with the cash/stock dividend last year? This may show they knew the common stock price was going to dive, and they didn't want someone taking over before they could issue another class of shares. This would show lack of fiduciary responsibility to protect shareholders, before the fact (before they devastated the share price).