The Bnei Yoel are a group of Satmar

Satmar (Hasidic dynasty)

Satmar is a Hasidic movement comprising mostly Hungarian and Romanian Hasidic Jewish Holocaust survivors and their descendants. It was founded and led by the late Hungarian-born Grand Rebbe Yoel Teitelbaum , who was the rabbi of Szatmárnémeti, Hungary...

 Hasidim

Hasidic Judaism

Hasidic Judaism or Hasidism, from the Hebrew —Ḥasidut in Sephardi, Chasidus in Ashkenazi, meaning "piety" , is a branch of Orthodox Judaism that promotes spirituality and joy through the popularisation and internalisation of Jewish mysticism as the fundamental aspects of the Jewish faith...

, followers of Rebbe

Rebbe

Rebbe , which means master, teacher, or mentor, is a Yiddish word derived from the Hebrew word Rabbi. It often refers to the leader of a Hasidic Jewish movement...

 Joel Teitelbaum

Joel Teitelbaum

Joel Teitelbaum, known as Reb Yoelish or the Satmar Rav , was a prominent Hungarian Hasidic rebbe and Talmudic scholar. He was probably the best known Haredi opponent of all forms of modern political Zionism...

, who after the death of Rebbe Joel refused to accept the leadership of the new Grand Rabbi of Satmar, Rebbe Moshe Teitelbaum a nephew of Rebbe Joel, as well as a leadership from any other Rebbe.
They are also known as:

• "The Rebbetzin's Hasidim," referring to Rabbi Joel Teitelbaum's surviving wife. (A "rebbetzin
  Rebbetzin
  Rebbitzin or Rabbanit is the title used for the wife of a rabbi, typically from the Orthodox, or Haredi, and Hasidic Jewish groups...
  
  " is the title for an Orthodox
  Orthodox Judaism
  Orthodox Judaism , is the approach to Judaism which adheres to the traditional interpretation and application of the laws and ethics of the Torah as legislated in the Talmudic texts by the Sanhedrin and subsequently developed and applied by the later authorities known as the Gaonim, Rishonim, and...
  
   rabbi
  Rabbi
  In Judaism, a rabbi is a teacher of Torah. This title derives from the Hebrew word רבי , meaning "My Master" , which is the way a student would address a master of Torah...
  
  's wife.)
• "kegeners," meaning those "who go against" something (in Yiddish
  Yiddish language
  Yiddish is a High German language of Ashkenazi Jewish origin, spoken throughout the world. It developed as a fusion of German dialects with Hebrew, Aramaic, Slavic languages and traces of Romance languages...
  
  .)
• "misnagdim," "opponents" in Yiddish, but not to be confused with the non-Hasidic movement of the misnagdim
  Misnagdim
  Misnagdim or Mitnagdim is a Hebrew word meaning "opponents". It is the plural of misnaged or mitnaged. Most prominent among the Misnagdim was Rabbi Elijah ben Shlomo Zalman , commonly known as the Vilna Gaon or the Gra...
  
   the ideological opponents of the original Hasidic movement in the 18th century.

Some members of the Bnei Yoel have taken the side of Rabbi Zalman Leib Teitelbaum in the dispute that erupted about the succession of Rebbe Moshe Teitelbaum, in which brothers Rabbi Aaron Teitelbaum

Aaron Teitelbaum

Rabbi Aaron Teitelbaum is one of two Grand Rebbes of Satmar, and the chief rabbi of the Satmar community in Kiryas Joel, New York...

and Rabbi Zalman Leib Teitelbaum both claimed the right to become the new Rebbe.

Some of the Bnei Yoel who have taken the side of Rabbi Zalman Leib but did oppose Rebbe Zalman's father, Rebbe Moses, are often referred to the "Hasidim of Ahava Mesiteres" (Hasidim of "Hidden Love"), based on a discourse Rabbi Zalman Leib once gave.