I’m not opposed to bringing back those yellow stars for people who participate in that “scheming together” for foreign nations. Its a bit more visible than asking them to register as foreign agents secretly. I wouldn’t do it across the board, but rather, let people decide individually.
If they choose to join AIPAC or work with the ADL or send money to “Israel” then they get a star.
If they get caught not wearing the star, they get sentenced to 6 months unclothed in Antarctica…which probably would not be long enough for them to figure out if penguin meat was kosher.