“I always feel so bad for those parents, because you watch the shock on their face when they find out that their child has been abused, and then they get all of the pressure,” Ms. White said.

Mr. Hynes’s refusal to publicize the names of people arrested through Kol Tzedek has deepened suspicions among victims’ rights groups, while winning praise from some rabbis.

“I think that’s where the rabbis put a little pressure on him,” said Rabbi Shea Hecht, an informal adviser to Mr. Hynes. “I know I went to speak to him about that. I said ‘Listen, you got to do the arrest, you go to do the investigation, but please don’t give out the names before we know if the man is guilty.’ ”

In response to a Freedom of Information request by The Times, Mr. Hynes’s office acknowledged that in the “vast majority of cases, the disclosure of a defendant’s name would not tend to reveal the identity of the sex-crime victim.”

But, the office said, because the ultra-Orthodox community is “very tight-knit and insular,” there is “significant danger” that disclosure would cause victims to withdraw cooperation, making prosecutions “extremely difficult, if not impossible.”

Several former prosecutors interviewed for this article said the policy seemed to make little sense.

“The idea is that the more information you give out, the more likely it is that victims might come forward with complaints,” said Bennett L. Gershman, a former Manhattan prosecutor who specializes in prosecutorial conduct at Pace University Law School. “So the idea that a prosecutor would conceal this kind of information strikes me as illogical, and almost perverse.”