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>  They confirmed Hungary had a lot of jews. Which is most likely why that sign focuses on gypsies
Altrough im not from hungarian but we were a subject of hungarian kingdom yes 
Jews were a very numerous in hungary (6th largest jewish population) especially in budapest which was a basically a metropolitan city and had one of the biggest golden ages in kingdom during the rule of ottomans there and during hungarization era (in latter was a good chance that official you had to deal with was a jew)

These factors may also expalin a lot of many pro gypsy concessions (until maria theresias shutdown) im kingdom of hungary (apart of nobility stances of antiquated ideas of land and races under them)