First, it was federal Judge Jed Rakoff, who has refused to accept “no harm, no fowl” deals with the SEC, and now U.S. District Judge Sidney Stein is questioning the fairness of a settlement of shareholder lawsuit:

A Manhattan federal judge on Monday signaled he will not rubber-stamp Citigroup Inc’s proposed $590 million settlement of a shareholder lawsuit accusing it of hiding tens of billions of dollars of toxic mortgage assets.

U.S. District Judge Sidney Stein asked lawyers for the bank and its shareholders to address several issues at an April 8 fairness hearing, including requested legal fees and expenses of roughly $100 million, and the absence of payments by former Citigroup executives.

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Stein joined other judges in recent years to question the fairness of large legal settlements in the financial industry.

Citigroup awaits a decision from the federal appeals court in New York on whether Stein’s colleague Jed Rakoff properly rejected a $285 million settlement with the U.S. Securities and Exchange Commission over the alleged defrauding of investors.

On Thursday, U.S. District Judge Victor Marrero in Manhattan cited that case in delaying a decision to approve the SEC’s $602 million insider trading settlement with a unit of Steven Cohen’s hedge fund SAC Capital Advisors LP.

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According to court papers, the shareholder settlement also resolved claims against several former top Citigroup officials, including Chief Executive Charles Prince and senior adviser Robert Rubin. Stein asked whether this was proper.

“Does the absence of any payments from the individual defendants render the settlement unfair to class members who still hold the Citigroup stock they purchased during the class period?” he asked both sides to address.

More of this, please.