History of Germany (1945–90) eventually hundreds of thousands of people in several cities—particularly in Leipzig—continued to grow. On 7 October, the Soviet leader Mikhail Gorbachev visited Berlin to celebrate the 40th anniversary of the establishment of East Germany and urged the East German leadership to pursue reform, without success. The movement of civil resistance against the East German regime—both the emigration and the demonstrations—continued unabated. On 18 October, Erich Honecker was forced to resign as head of the SED and as head of state and was replaced by Egon Krenz. But the exodus continued unabated, and pressure for political reform mounted. On 4 November,
Erich Honecker stabilisation, he underwent surgery on 18 August 1989 to remove his inflamed gallbladder and, due to a perforation, part of his colon. According to the urologist Peter Althaus, the surgeons left a suspected carcinogenic nodule in Honecker’s right kidney due to his weak condition, and also failed to inform the patient of the suspected cancer; other sources say the tumor was simply undetected. As a result of this operation, Honecker was away from his office until late September 1989. Back in office, Honecker had to contend with the rising number and strength of demonstrations across East Germany that had first