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ПОКАЗЫВАТЬ (УКАЗЫВАТЬ, ТЫКАТЬ) ПАЛЬЦЕМ (-ами) (на кого-что) ТЫКАТЬ ПАЛЬ-ЦЕМ (-ами) в кого all coll, disapprov VP subj and obj: human or collect) to censure s.o. (or some organization, group etc) openly, publicly, drawing general attention to the object of blame

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)