Many lost their businesses, their property, but I'm convinced by the documents in Michelle Malkin's book that the CALIFORNIA based Japanese had enough spies in their number that you had to move them out. Germans and Italians who were arrested/confined were only mainstream card-carrying fascists/Bund members to my knowledge. I welcome different information, but I don't think any "ordinary" Germans or Italians were rounded up.
Yeah if it wasn't for the barbed wire and guard towers you might think they were at Club Med. </sarcasm>