"I am worried today that under the banner of identity politics some political factions are trying to gain power by splitting the Americans, and they undermine the values that hold us together, such as a shared commitment to the success of our country "This is the breeding ground for hatred, and we have to reject it," said Barr.
The full-day event, which included remarks by heads of the FBI and Treasury, came as President Donald Trump launched a new series of attacks on a group of progressive congressional women he said had "racist" and " anti "-Semitic language.
Trump was criticized on Sunday for his own racist tweet, in which he demanded that the group of democratic legislators ̵
Barr said on Monday that he was "deeply concerned" about the increase in hate crimes and political violence in the country, calling it a "critical priority" for the Department of Justice.
He also compared the various forms of "anti-Semitism" with cancer, which can "quickly metastasize and become systemic without a good defense system".
"Just like a physical body, body politics must have an immune system that resists anti-Semitism and other forms of racial hatred," said Barr.
In 2017, according to the FBI, more than half of the victims of religiously motivated hate crimes were involved in anti-Jewish incidents.
Barr referred to a "sharp rise" in the attacks on Orthodox Jews in New York City this year and the destruction of 59 tombstones in a Jewish cemetery in Massachusetts, as well as "cover stories about horrific shootings."
Eleven people were killed when an armed man in Pittsburgh fired in a synagogue last year. The gunman was charged by the Ministry of Justice this year for several new hate crimes.
The conference also focused on the Israeli boycott movement at the universities, which, according to organizers, resulted from the country's treatment of Palestinians.
Later at the summit, Education Minister Betsy DeVos said the Boycott, Disposal and Sanctions Movement (BDS) was a "perilous threat" and a source of anti-Semitism in schools.