Slonim is a Hasidic dynasty originating in the town of Slonim, which is now in Belarus. Today, there are two Slonimer Rebbes, both in Israel: One resides in Jerusalem, and the other in Bnei Brak. Colloquially, the Jerusalem side is called the "White" side, and the Bnei Brak side is called the "Black". When Slonim Hasidim split into separate factions, the leader of one, Rabbi Sholom Noach Berezovsky, had a white beard, and the leader of the other, Rabbi Avraham Weinberg, had a black beard. The factions are distinguished by different Hebrew spellings, the Jerusalem group being known as סלונים and the Bnei Brak group being known as סלאנים. They are two distinct groups today, and have many differences between them. The first Rebbe of Slonim, Rabbi Avraham Weinberg, was the author of Yesod HaAvodah. In 1873, he sent a group of his grandchildren and other Hasidim to settle in Ottoman Palestine; they set up their community in Tiberias. Almost all of the Slonimer Hasidim in Europe perished at the hands of the Nazis in the Holocaust. The present-day Slonimer community was rebuilt from the Slonimer Hasidim who had settled in Israel.
In addition to those works revered by all Hasidim, the Slonimer Hasidim particularly revere the following books: Yesod HaAvodah, Divrei Shmuel, Beis Avraham, Birkas Avraham, Nachal Aison. The Slonimer rebbes of Jerusalem have authored two tremendously popular Hasidic works, Nesivos Shalom, by the previous Slonimer Rebbe of Jerusalem, and Darchei Noam, by the present Slonimer Rebbe of Jerusalem. Nesivos Shalom is extremely popular even outside of Hasidic circles. The version of the siddur used by the Slonimer Hasidim in Jerusalem is called "Siddur Magen Avraham", and by the Slonimer Hasidim in Bnei Brak, "Siddur Oir Hayoshor".
Currently, in Israel, there reside approximately 1,300 families that follow the Slonimer Rebbe from Jerusalem. In 2010, a dispute arose in Immanuel, a Jewish settlement in the northern West Bank, over the integration of Ashkenazi Slonim girls in a school with Sephardi girls from non-religious families. Over 120,000 Torah-observant Jews, including Haredi and Dati Leumi Jews, rallied in Israel to keep the groups separate, with the fathers of 40 girls being jailed for their refusal to comply. The families insisted it was not a "racial" issue, as 30% of those in the Hasidic track are Sephardic, and three fathers jailed were Sephardic, but, rather, that the "desire to remove their daughters from the influence of those less strict in their religious observance, watching TVat home, having access to the internet, and a more lax dress code among the other track in the school have been cited".
