The Germans wanted to deploy the Dutch police force during deportations. In Amsterdam in May 1941, they replaced the chief constable with a National Socialist, after having replaced the mayor earlier. The new chief constable, Sybren Tulp, was a great sympathiser of Nazi Germany, already before the war. He was charismatic and stood by his men, even when they got into trouble with members of the NBS. He even defended anti-German policemen. His approach ensured the cooperation of his policemen with the German authorities. Consequently, many obeyed when the police was deployed for rounding up Jews in 1942; only a small number of policemen objected on grounds of moral dilemma.