Read this: Several political figures who served as Zhejiang's top political office of Communist Party Secretary have played key roles in various events in PRC history. Tan Zhenlin (term 1949-1952), the inaugural Party Secretary, was one of the leading voices against Mao's Cultural Revolution during the so-called February Countercurrent of 1967. Jiang Hua (term 1956-1968), was the "chief justice" on the Special Court in the case against the Gang of Four in 1980. Three provincial Party Secretaries since the 1990s have gone onto prominence at the national level. They include CPC General Secretary and President Xi Jinping (term 2002-2007), National People's Congress Chairman and former Vice-Premier Zhang Dejiang (term 1998-2002), and Zhao Hongzhu (term 2007-2012), the Deputy Secretary of the Central Commission for Discipline Inspection, China's top anti-corruption body. Of Zhejiang's fourteen Party Secretaries since 1949, none were native to the province.
Now answer this question, if there is an answer (If it cannot be answered, return "unanswerable"): When was the so-called February Countercurrent?
1967