Adam's family wasn't as simple as it seemed to the outside world. The Levinsons were one of the aristocratic families of Germany. They didn't just have theirs roots embedded in the business world, but deep in the underworld as well.
They held the throne of the most feared criminal organization of Europe, The Brigade of Sin. The throne was passed down to the first born of the main family, whether it was a boy or a girl. Generation after generation, it continued to be passed down before it was handed over to Adam's father.
The organization dealt in arms and ammunitions mainly. A major share of which were bought by the government. And like that, the organization had the government's approval and protection within the main countries of Europe. They carried out their work without any disruption from other external factors. Other organizations weren't strong enough to interfere in their business, so they found it better to stay out of their path.