I was several times on the website of the "Fonds de Moscou". But I couldn't find out if they have some records about Ludwig Jacob Straus(s) also known as Louis Straus(s) or not. He was born in Mannheim on the 27.02.1917 and emigrated to Paris in 1933. He was interned in camp Tombebouc and camp de Savaud in Casseneuil (both situated in the Departement Lot-et-Garonne). On the 09.09.1942 he was deported on the 20th convoy from Drancy to Auschwitz. I found the documents about this convoy on the website of the Mémorial de la Shoah. But I don't know where he lived and what he did before he was in the camps in Lot-et-Garonne. To find him in the 1936 census of Paris is impossible if I don't know the address where he lived at that time.
Thanks and best regards