employed in 117 workshops, which – Rumkowski once boasted to the mayor of Łódź – were a "gold mine." It was possibly because of this productivity that the Łódź Ghetto managed to survive long after all the other ghettos in occupied Poland were liquidated. Rumkowski systematically singled out for expulsion his political opponents, or anyone who might have had the capacity to lead a resistance to the Nazis. Conditions were harsh and the population was entirely dependent on the Germans. Typical intake, made available, averaged between 700 and 900 calories per day, about half the calories required for survival. People affiliated with Rumkowski received disproportionately larger deliveries of food, medicine, and other rationed necessities. Everywhere else starvation was rampant and diseases like tuberculosis widespread, fueling dissatisfaction with Rumkowski's administration, which led to a series of strikes in the factories. In most instances, Rumkowski relied on the Jewish police to quell the discontented workers, although at least in one instance, the German Order Police was asked to intervene. Strikes usually erupted over the reduction of food rations. Disease was a major feature of ghetto life with which the Judenrat had to contend. Medical supplies were critically limited, and the ghetto was severely overcrowded. The entire population of 164,000 people was forced into an area of , of which were developed and habitable. Fuel supplies were severely short, and people burned whatever they could to survive the Polish winter. Some 18,000 people in the ghetto are believed to have died during a famine in 1942, and all together, about 43,800 people died in the ghetto from starvation and infectious disease. Deportations Overcrowding in the ghetto was exacerbated by the influx of some 40,000 Polish Jews forced out from the surrounding Warthegau areas, as well as by the Holocaust transports of foreign Jews resettled to Łódź from Vienna, Berlin, Cologne, Hamburg and other cities in Nazi Germany, as well as from Luxembourg, and the Protectorate of Bohemia and Moravia including the citywide Theresienstadt concentration camp. Heinrich Himmler visited the ghetto for the first time on 7 June 1941. On 29 July 1941, following an inspection, most patients of the ghetto's psychiatric hospital were taken away never to return. "They understood, for example, why they had been injected with tranquilizers in the night. Injections of scopolamine were used, at the request of the Nazi authorities." Situated north of Łódź in the town of Chełmno,