 Following their admission, Communist activities within the KMT, often covert, soon attracted opposition to this policy among prominent KMT members.Internal conflicts between left- and right-wing leaders of the KMT with regards to the CPC problem continued right up to the launch of the Northern Expedition.Plans for a Northern Expedition originated with Sun Yat-sen. After his expulsion from the government in Peking, by 1920 he had made a military comeback, gaining control of some parts of Guangdong province.