Collection of Kapitän Michael Sommer en Fa. Union, for the purchase of raw materials for the Wehrmacht in the black market in the Netherlands, 1942-1922 Two companies purchased goods by command of Oberst Veltjens, Goering's representative in the Netherlands, 1942-1944; Kapitän Michael Sommer served as the person responsible for the purchase of raw materials for the Wehrmacht in the black market in the Netherlands, which was carried out in the context of the Vierjahresplan of the Blau-Aktion (black market); Included in the collection: Correspondence between Kapitän Michael Sommer and various organizations, regarding the purchase of raw materials for the Wehrmacht in the black market in the Netherlands, 1942-1944; Correspondence with various organizations, including the Joodse Raad in Amsterdam, the Sicherheitspolizei (SIPO), and the mayor of Amsterdam, regarding easements for the mayor's Jewish employees, 1942-1944; Correspondence regarding receiving permits, exemptions from Arbeitseinsatz, and exemption from the obligation to mark Jews with a yellow badge; the letters are arranged in alphabetical order, from A to Z.