Young Advocates for Fair Education

In 2011, Mr. Moster founded Young Advocates for Fair Education, or Yaffed.

Last year, Yaffed sponsored a billboard near the Prospect Expressway in Brooklyn with a quotation in Hebrew from the Talmud, “You must provide your son a proper education.” Below that was a caveat in English. “It’s your mitzvah” — or religious commandment — it said. “It’s the law.”

After the billboard went up, Mr. Moster said, Yaffed was bombarded with sympathetic emails and phone calls. Then word spread that Mr. Moster was off the path, and the response changed. “Suddenly it was, ‘We don’t want anything to do with you,’ ” he said.

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