Which situation proved a difficult problem for Jewish immigrants seeking work in the United States? having to work on Saturdays
having to work in grocery stores
having to work in the garment industry
having to work in cigar factories

A: having to work on Saturdays

Explanation:

although the legal justifications for the trials and their procedural innovations were controversial at the time, the nuremberg trials are now regarded as a milestone toward the establishment of a permanent international court, and an important precedent for dealing with later instances of genocide and other crimes