"The Nazis, the KKK, and white supremacists are risky anti-Semites", RJC Chairman Norm Coleman and Executive Director Matt Brooks said in a statement.
Mr Spencer, whom the Southern Poverty Law Center describes as "a suit-and-tie version of the white supremacists of old, a kind of professional racist in khakis", was a leading figure in the march organised to protest the removal of a statue of Confederate General Robert E Lee. But they were also troubled by Trump's reaction.
In an off-the-rails news conference on Tuesday, Trump said "both sides" deserve blame for violence that erupted in Charlottesville, Va., over the weekend during a white nationalist rally.
A 32-year-old woman was killed Saturday in Charlottesville when a vehicle driven by a white supremacist plowed into a group of counter-protesters.
Netanyahu's near silence on the march staged by anti-Semitic white nationalists - and Trump's assertion that "both sides" were responsible for the violence - appears to reflect the Israeli leader's desire to remain in the good graces of the embattled US president.
Leaders of liberal Jewish groups, who represent the majority of American Jews, are already at odds with the Israeli government over issues such as egalitarian prayer and recognition of religious conversions. Marchers passed by carrying flags with swastikas and shouting the Nazi salute "Sieg Heil", the synagogue president said.
Trump's response to the events in Charlottesville has begun to attract concern in Israel, even among politicians who admire him.
A roundup of Thursday's editorials includes a look at the fallout from President Donald Trump's remarks about the violence in Charlottesville, America's racial past and Elvis and the opioid abuse problem. "There must be no quarter for bigotry in our country".
"When Neo-Nazis march in Charlottesville and scream slogans against Jews and in support of white supremacy, the condemnation has to be unambiguous".
However, some have praised how Trump has handled the fallout from the Virginia rally.
Last February, during a visit to the White House, Netanyahu said "there is no greater supporter of the Jewish people and the Jewish state than Donald Trump".
Here are some opinions from the Right and from the Left. "David Duke is worse than Louis Farrakhan?"
"Latin America has always been friendly to Israel, but I think we're at a position where these relationships can be far, far, far advanced", Netanyahu told the Latin American leader. "We were not looking for him to single out the hate groups on the right". "They're vastly overrepresented in what you could call the establishment, that is, Ivy League-educated people who really determine policy, and white people are being disposed from this country", he said.
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Other players rumored to be destined for Arsenal include; Sokratis Papastathopoulos, from Borussia Dortmund, and Saul Niguez. If they are rumored to buy an elite player, during the transfer window, they play well which increases the odds of winning.
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Now if that isn’t the epitome of what a BFF is, I don’t know what is! Selena continues to be on chronic medication. There is also a huge list of celebrities past like famous painter vincent Van Gogh who suffered with this disease.