From a letter of the Rebbe, Motzoei Tisha B’Av 5744/1984:
“Chof Menachem Av is the yahrzeit and hilula of my father, Harav Levi Yitzchak ben Harav Boruch Schneur .…ז”ל
It is my obligation and great zechus to suggest, request, etc., that everyone study from his teachings at the farbrengen [of Chof Av], and to donate to charity in his memory on this day.
He sacrificed his life to spread Yiddishkeit amongst the Jewish people “behind the Iron Curtain,” for which he was imprisoned, was sentenced to exile, perished in exile, and his resting place is there.
May his merit protect us and all the Jewish people שליט”א”
Click here for a full Chov Av guide