ation ▁cam ps . ▁ ▁Background ▁ ▁Following ▁the ▁ 1 9 4 0 ▁German ▁invasion ▁and ▁occupation ▁of ▁the ▁Netherlands , ▁everyone ▁aged ▁ 1 5 ▁and ▁older ▁was ▁required ▁to ▁carry ▁an ▁identification ▁card , ▁the ▁pers o ons bew ij s , ▁with ▁them ▁at ▁all ▁times . ▁Jews ▁had ▁to ▁carry ▁a ▁pers o ons bew ij s ▁marked ▁with ▁a ▁large ▁J . ▁Res istance ▁members ▁soon ▁started ▁to ▁for ge ▁identification ▁cards ▁at ▁a ▁large ▁scale ▁– ▁the ▁largest ▁such ▁operation , ▁led ▁by ▁Ger rit ▁van ▁der ▁Ve en , ▁produced ▁some ▁ 8 0 , 0 0 0 ▁for ged ▁documents . ▁However , ▁for ged ▁documents ▁could ▁be ▁easily ▁detected ▁because ▁they ▁could ▁be ▁compared ▁against ▁the ▁records ▁in ▁the ▁civil ▁reg ist ries . ▁Some ▁civil ▁servants ▁were ▁willing ▁to ▁f als ify ▁records ▁in ▁the ▁civil ▁registry ▁so ▁that ▁they ▁would ▁match ▁up ▁with ▁for ged ▁identification ▁cards . ▁Nevertheless , ▁the ▁civil ▁reg ist ries ▁remained ▁a ▁pot ent ▁weapon ▁in ▁the ▁hands ▁of ▁the ▁Naz is ▁to ▁identify ▁members ▁of ▁the ▁Dutch ▁population ▁who ▁were ▁Jewish , ▁potential ▁members ▁of ▁the ▁resistance ▁or ▁could ▁be ▁called ▁up ▁for ▁forced ▁labour ▁duty . ▁ ▁In ▁ 1 9 4 3 , ▁a ▁group ▁of ▁resistance ▁members , ▁led ▁by ▁sculpt or ▁Ger rit ▁van ▁der ▁Ve en ▁and ▁painter ▁and ▁author ▁Wille m ▁Ar onde us , ▁met icul ously ▁planned ▁to ▁carry ▁out ▁a ▁sab ot age ▁attack ▁on ▁the