The number of reported anti-Semitic incidents surged 57 percent in 2017, according to an annual report by the Anti-Defamation League.
The organization’s Audit of Anti-Semitic Incidents, released Tuesday, found 1,986 such incidents in 2017, compared with 1,267 in 2016. That increase was the largest in a single year since the A.D.L. began tracking in 1979.
Only once since 1979 has the Anti-Defamation League recorded more incidents: 2,066 in 1994. Since then, the numbers had mostly declined. There were small increases in 2014 and 2015. Then, in 2016, the count began to shoot up.
“It had been trending in the right direction for a long time,” Jonathan A. Greenblatt, chief executive of the A.D.L., said in an interview. “And then something changed.”