14 November 1937 was a watershed in Irgun activity. From that date, the Irgun increased its reprisals. Following an increase in the number of attacks aimed at Jews, including the killing of five kibbutz members near Kiryat Anavim (today kibbutz Ma'ale HaHamisha), the Irgun undertook a series of attacks in various places in Jerusalem, killing five Arabs. Operations were also undertaken in Haifa (shooting at the Arab-populated Wadi Nisnas neighborhood) and in Herzliya. The date is known as the day the policy of restraint (Havlagah) ended, or as Black Sunday when operations resulted in the murder of 10 Arabs. This is when the organization fully changed its policy, with the approval of Jabotinsky and Headquarters to the policy of "active defense" in respect of Irgun actions.