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Well, for example, in the Warsaw ghetto, they were staging an uprising. One the Nazi could not control -- they were forced back out of the ghetto time and again. The Jews, despite having little to no support outside of the ghetto managed to hold out for approximately four times as long as the Polish Army did when the Nazis invaded.
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Those who had not been sent elsewhere to die were already dead in the Warsaw ghetto
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Certainly a better one than any denier I've run across...
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Indeed. Let's look a bit more into Warsaw, all of this being well known and readily available to anyone willing to crack a book or even google a bit.
In summer and fall of 1942, approximately 300,000 Jews were deported from Warsaw or shot during roundups, in a well-documented Nazi action.
The ghetto population, which had reached between something like 450,000 and 490,000 IIRC, had been reduced considerably by the time of the large-scale deportation, with about 80,000 dying of disease and starvation and 10s of 1000s sent to labor camps, like the one at Treblinka, during this time. Before the 1942 deportations, official rations being at starvation levels, Warsaw's Jews operated large and small scale smuggling efforts, bringing in food to the ghetto from "Aryan" Warsaw to feed Jewish families.
Following the 1942 deportation action, around 60,000 Jews (maximum) were still living in Warsaw--35,000 living in the shrunken ghetto, legally and working in the large shops established there and the rest "wild" Jews, living in the ghetto or, in increasing numbers, as Jews fled the ghetto and hid on the "Aryan" side, in other parts of the city illegally. The shops in the remaining ghetto, under command of Untersturmfuhrer-SS Karl Brandt, produced a variety of goods for German concerns and for the war economy. In addition to the Jews in the workshops, the Werterfassung, a unit composed of Jews who survived the deportation, was pulled together to salvage the property left behind by deported Jews.
In January 1943, before the uprising, nearly 20,000 ghetto Jews (sources disagree on the exact number) were shipped to labor camps, at Himmler's order ("Our aim is to replace this Jewish manpower with Poles while consolidating the many Jewish KL firms into a few large Jewish KL enterprises in the eastern Generalgouvernement. For whatever happens, the Jews will have to disappear from there, too, someday, in accordance with the Fuhrer's will"). Some of the ghetto's shop owners (Tobbens and Schultz to name two) advocated this action and, along with the Nazis, encouraged Jews to turn themselves over for deportation to the camps in the Lublin region (some of the shop owners had made agreements with Globocnik to operate shops in the Lublin camps).
Most Warsaw Jews, suspicious of a repeat of the 1942 "Treblinka" action, refused to cooperate and began digging in in the ghetto, some of them preparing for armed resistance, most hoping to hide when need be until the city was liberated. It was during this period that the famous bunkers and tunnels were constructed, and that activists in two underground resistance organizations armed themselves in earnest.
The Jews shipped to the labor camps did not survive long:
It is estimated that about 15,000 Jews were transported from the Warsaw shops to the Poniatow camp, and I believe about 6,000 to Trawniki.
Following the ghetto uprising in spring 1943 and revolts at Treblinka (August) and Sobibor (October), Himmler decided to murder the workers in various camps in the Lublin region. His order for Operation Erntefest, as the action was named, opened with a statement of the "dangerous proportion" to which the Jewish problem in the area had grown as a result of the delaying tactics of the manufacturers and their sponsors.
Here is how Isaiah Trunk describes the fate of the workers shipped from the Warsaw shops to Poniatow and Trawniki during 1943: ". . . all [those sent to Trawniki] were killed during the mass slaughter of November 3, 1943. Four days later, on November 7, the neighboring camp of Poniatow was liquidated. In all, including the shopworkers who fell prey to Toebbens' treacherous promise that they would have a chance to survive the war if they listened to him, over 25,000 Jews were killed in both camps during those two days." (Judenrat, p419)
These are some of the things which Warsaw Jews were doing during the time which Clayton Moore inquired about.