Hasidic

One video posted to social media by a Hasidic group, Chabad, appears to show Jewish students being subject to a torrent of verbal abuse.

On that account, he posted a photograph of himself wearing Hasidic clothing; as well as a video titled: "The Jewish Faces that Control Hip-hop and Mainstream Black Music."

Mr. Epstein, a Hasidic Jew, said his choice of device was not unusual in the ultra-Orthodox Jewish community, which encourages the use of “kosher phones” with limited internet access.

Although most of the Jewish community in the capital, Brussels, is secular, the port city of Antwerp has a large ultra-Orthodox population and the largest Hasidic community in Europe.

He sought out Mr. Rudavsky as a collaborator, and their conversations led to a focus on the Hasidic community.