The Third Reich's government began persecuting the Romani as early as 1936 when they started to transfer the people to municipal internment camps on the outskirts of cities, a prelude to their deportation to concentration camps. A December 1937 decree on "crime prevention" provided the pretext for major roundups of Gypsies. Nine representatives of the Romani community in Germany were asked to compile lists of "pure-blooded" Romanis to be saved from deportation. However, the Germans often ignored these lists, and some individuals identified on them were still sent to concentration camps. Notable internment and concentration camps include Dachau, Dieselstrasse, Marzahn (which evolved from a municipal internment camp) and Vennhausen.