After Hitler came to power many German Jews began to move to the Netherlands as they believed that it’s neutrality during WWI, would mean it would be a safe place to escape the Nazi’s antisemitic policies. Many of those who entered the country did so illegally. The Dutch governement set up a series internment camps including one in the north-east at Westerbork.
The Netherlands had a Jewish population of 140,000; 75,000 of whom lived in Amsterdam. Many Jews attempted to escape the country. However, a series of anti-Jewish measures made this extremely difficult. In September 1940, Jewish newspapers were closed down. Then, during November, Jewish civil servants were sacked and the assets of all Jewish businesses were registered.
Throughout 1941, the situation for Jews in the Netherlands deteriorated. Jews were banned from public places, subjected to nighttime curfews and travel restrictions. Jewish students were also thrown out of schools and universities. Then, in March 1942, the German administration started confiscating Jewish property. A month later, on 29 April 1942, Jews were ordered to wear a yellow Star of David containing the word Joad (the Dutch word for Jew).
In July 1942, the Germans began rounding up Jews, sending them to Westerbork on their way to the extermination camps of Auschwitz and Sobibor in occupied Poland, where they were murdered. The Dutch police actively collaborated and assisted the German authorities in rounding up of Jews on the streets or in their homes. Dutch railway workers administered and operated the rolling stock in which Jews were deported to and from Westerbork. The last train left Westerbork for Auschwitz-Birkenau on 3 September 1944, by which time 107,000 Jews had been deported. Of this number only 5,200 survived.
Whilst the geography of the Netherlands made escape difficult, between 25,000-30,000 Jews managed to go into hiding assisted by the Dutch underground. Remarkably, of this total, two-thirds of Dutch Jews in hiding managed to survive.
Information from: http://www.theholocaustexplained.org/ks4/the-nazi-impact-on-europe/nazi-occupation-case-studies/the-netherlands?vid=2#.Vt0vDGdf2Uk