 Complete the following phrase:  On 24 December 1941, Altman and Haika Grossman managed to return to the Vilna Ghetto, where they met with Abba Kovner and the leadership of the United Partisan Organization. Altman described the horrible conditions in the Warsaw Ghetto, but still urged the Zionist leaders to evacuate there since the Vilna Ghetto was being systematically depopulated in a 