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Logistics- well, as the rebuilding of the city started right after the war, there was A LOT of military equipment that noone knew what to do with, so it was used to help in everyday situations. Tanks for example were used to destroy buildings, just like bulldozers. Here is an example: http://www.wolbrom.pl/getattachment/cafef3ba-b4f8-4b88-8469-265830af6a0a/.aspx?maxsidesize=1024
Materials – thats a longer topic. Right after the war the borders of USSR, Poland and Germany had changed. For a long time people of those nations were neighbours for each other and a lot of Ukrainians lived in Poland, Poles in Ukraine. Same thing with Germans. The hatred between those nations have risen drastically. Thanks to WW2 and this: https://en.wikipedia.org/wiki/Massacres_of_Poles_in_Volhynia_and_Eastern_Galicia
Governments decided to run an resettling actions on a large scale. Germans went to new Germany and Poles from Lviv or Vilnus replaced them. Many post German buildings in Wroclaw or Szczecin were demolished in the process and all the materials from them were collected and sent to Warsaw.
Employees – not sure, but since everyone had to have a job in communism (even if it was stupid, completly not needed one) probably tons of people were forced to move there for work.
Also You have to know that rebuiling Warsaw took about ten years. Heck Royal Palace in Warsaw was rebuilt in mid 70s, and still few historical buildings are waiting for their turn (for example Saxon Palace https://en.wikipedia.org/wiki/Saxon_Palace ).
P.S. This picture shows how stupid communism was and how they aprroached the rebuilding process. Shiny gift from Stalin and still a lots of ruins around him. http://culture.pl/sites/default/files/images/imported/sztuki%20wizualne/opisy%20dziel/sempolinski%20%20%20palac%20kultury%20i%20nauki%20z%20ruinami/sempolinski%20ruiny%20i%20pkin%201956_6416671.jpg