The Anti-Defamation League says the campaign is "driven by white supremacists and anti-Semites" and "has all the hallmarks of classic Jewish conspiracy theories."
Juan Thompson, a former journalist arrested for allegedly making bomb threats against a number of Jewish schools and community centers, pleaded "not guilty" in New York.
Germany's far-right Alternative for Germany party has defended itself against charges of anti-Semitism.
A Jewish center in Sweden was targeted with graffiti, swastika stickers and neo-Nazi threats.
A prominent European Jewish leader has told Jews that anti-Semitic parties taking power should be a "red line."
Gilad Erdan's team says list's creation would involve the monitoring of social media accounts.
They want the government to "maintain and strengthen" the Office to Monitor and Combat Anti-Semitism and create a new office for domestic issues.
Authorities prevented Hugh Lanning from entering the country Sunday night.
Threats were phoned in or emailed to JCCs in states including New York, Wisconsin, Illinois and Florida overnight and early on Tuesday.
Thompson once wrote for "The Intercept," which later said it had "discovered a pattern of deception" in his work.
The threats, all of which appeared to be hoaxes, were received in Alabama, Delaware, Florida, Indiana, Maryland, Michigan, New Jersey, New York, North Carolina, Pennsylvania and Virginia.
Vandals knocked over more than 500 tombstones at Mount Carmel Cemetery, days after a similar incident occurred at a Jewish cemetery near St. Louis.
The FBI has previously said it is investigating recent threats as "possible civil rights violations."
According to experts, the next Hitler will appear wrapped in a flag, promising protection from Islam.
"I am in no way supporting any kind of hateful attitudes," the vlogger said in a blog post responding to the controversy.
Trump's pick for chief strategist and senior counselor is making America angry again.
The frenzied bloodlust in the cry "Lock her up!" conjures up the specter of a lynching.
This is yet another bizarro-world, black-is-white bit of lunacy.
Stephen Bannon also was accused of domestic violence but charges were later dismissed.