X показывает пальцем на Y-a = X points a (the, his) finger at Y.
В двадцатых годах все понемногу учили Мандельштама, в тридцатых на него показывали пальцами, а он жил, поплёвывая, в окружении дикарей и делал своё дело (Мандельштам 2). In the twenties everybody tried to reason with M(andelstam), but in the thirties they were already pointing their fingers at him
not concealing his distaste, he went on living among the barbarians and did what he had to do (2a)Большой русско-английский фразеологический словарь. — М.: ACT-ПРЕСС КНИГА. С.И. Лубенская. 2004.