Two years ago, Rabbi Moshe Zigelman went to prison rather than testify against fellow Jews in a federal tax-evasion case and receive a lesser punishment.

Now, federal prosecutors are threatening him with a return to jail unless the 64-year-old devout Hasid agrees to testify before a grand jury regarding the federal government's ongoing probe of tax evasion in his Orthodox Jewish sect. On Wednesday, they will ask a judge to order him to testify or be found in contempt.

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