In actions brought seeking to recover certain securities in accounts that had been maintained by a registered securities brokerage firm that was the subject of liquidation proceedings initiated by the SEC, summary judgment and dismissal rulings in favor of defendants are affirmed where: 1) summary judgment for defendants on a state law unlawful conversion claim was proper based on collateral estoppel or issue preclusion; and 2) dismissal of plaintiff's claim against federal defendants for the return of securities pursuant to Federal Rule of Criminal Procedure 41(g) was proper as no set of provable facts existed under which plaintiff would be entitled to a remedy because defendants could neither return the securities nor be sued for money damages under Rule 41(g).