Before Lominadze returned to Moscow in December 1927, Stalin sent out a young German named Heinz Neumann to assist him and "cajole the CCP into organizing an urban uprising in time for the 15th Party Congress of the CPSU." Although the disastrous Guangzhou Uprising was basically Neumann's doing, Stalin blamed both him and Lominadze; as he had previously, "he refused to take any responsibility for the failure of the program he had initiated, but held the miscalculation of the comrades on the spot responsible for the failure of the uprising."