It is one of the three holidays named "day of liberation" by Chabad-Lubavitch Rabbi Yosef Yitzchak Schneerson was arrested on June 15, 1927 (15 Sivan, 5687) in Leningrad, USSR (now St. Petersburg, Russia) by the Soviet secret police also known as the Joint State Political Directorate (OGPU).

[1][2] The Rebbe was charged with conducting Counter-Revolutionary activities,[3][4] which were seen as counter to the state's efforts to eliminate religion from public life[5][6] and he was sentenced to death by Soviet authorities.

[13] Rabbi Yosef Yitzchak Schneerson's situation garnered international attention, prompting various Jewish communities and leaders worldwide to intervene on his behalf.

[26] The commemoration of the 12th and 13th of Tammuz was celebrated and observed by Rabbi Menachem Mendel Schneerson, the seventh Rebbe of Chabad-Lubavitch,[27] who emphasized their importance in his teachings and leadership.

[28][29] Communal gatherings known as Farbrengens are organized in Chabad centers, Yeshivas and Synagogues, where followers come together, where many hear speeches, sing niggunim (melodic tunes), and share inspiring stories about Rabbi Yosef Yitzchak's life and contributions.