Yes. I believe using Alucard instead of his real name was important to the spell, somehow. It was a great deal stronger than a simple spell. For every mark that he bears, I have a similar one. He is bound to my blood, and I am, through that bond, unable to break free of him as well.
But he kills things efficiently, and is dead now.
It is a pleasure to meet you, Mr. Turner. I am Integral Hellsing. I believe that access to your library would no doubt prove quite enlightening. And perhaps a few moments to ask questions ever now and then?