witch hunt
noun [ C ] disapproving uk/ˈwɪtʃ ˌhʌnt/ us/ˈwɪtʃ ˌhʌnt/
对反对派的搜捕；政治迫害
an attempt to find and punish people whose opinions are unpopular and who are said to be a danger to society
In America, Senator McCarthy led a witch hunt against people suspected of being communists. 在美国，参议员麦卡锡发动了一场对共产党嫌疑分子的迫害。