Final answer:
The SS rounded up Jack and his family during the Nazi occupation of the Soviet Union in 1941.
Step-by-step explanation:
The SS rounded up Jack, along with the rest of his family, during the Nazi occupation of the Soviet Union in 1941. The SS, or Schutzstaffel, were special units of soldiers who were responsible for killing Jews and other groups targeted by the Nazi regime. They would go into Jewish communities, gather the residents, and force them to give up their valuables before shooting and burying them. They also used gas vans to kill people.