minhag - Who is this (Haredi) Rabbi?

Who is this Rabbi?

This is a still taken from the beginning of a documentary on Haredi jews in Jerusalem: The Anti-zionist Jews of Jerusalem

I am curious to learn who this Rabbi is, why he is dressed this way and what kind of festivity we are witnessing here?

Answer

He is the Kaliver Rebbe.

[Rabbi] Menachem Mendel Taub (born 1923) is the Rebbe of the Kaliv Hasidic dynasty. Born in Transylvania in 1923, he is seventh in a direct paternal line to the founder of the dynasty, Rabbi Yitzchak Izak of Kaliv, a disciple of the Rebbe Reb Elimelech of Lizhensk.

An extremely talented Rabbi who recently moved his headquarters from Bnei Braq to Jerusalem. He speaks quite a few languages, and as a survivor of Auschwitz, he regularly speaks passionately about the Holocaust and Jewish unity. As a twin, Dr Mengele experimented on him and his sister (who didn't survive).

As a Chassidic Rebbe, he regularly conducts tischen where his Chassidim will join him for his meal. This particular picture is likely on Tu B'Shvat when Rebbes are known to distribute fruit.

And, video caption aside, he is NOT anti-Zionist!

UPDATE: The Kaliver Rebbe passed away in Jerusalem, on Nisan 23, 5779 [April 28, 2019] (aged 95–96).