The Anti-Defamation League has surveilled leftwing activists and “regularly tracks, profiles and sends threat assessments of individuals” it perceives as a problem, according to an internal email obtained by the Guardian. The memo shows the ADL collected information on a Black Indianapolis activist, Tatjana Rebelle, who worked on Deadly Exchange, a national campaign against an ADL-backed program to send US police officials for training with the Israeli military.

In the email, which included a picture and personal information about Rebelle, ADL head of security Chris Delia concluded Rebelle was “a radical with antisemitic and hateful views” but was “not a threat” to the organization. Still, he recommended the file be referred to the organization’s Center on Extremism, which tracks, in its words, “extremist trends, ideologies and groups across the ideological spectrum”.

The memo is the latest evidence that the ADL has spied on, surveilled or tracked its opponents on the left and right. In 1993, the ADL faced multiple lawsuits and an FBI investigation over a nationwide intelligence network it developed over the span of several decades with an investigator on its payroll, Roy Bullock.

Bullock was alleged to have infiltrated or kept files on the United Auto Workers union, Congresswoman Nancy Pelosi, neo-Nazi groups, Mother Jones magazine, the American Civil Liberties Union, the NAACP and many more. He also allegedly sold personal information on US politicians and others to the apartheid South African government at the ADL’s behest. The ADL initially backed the apartheid regime, labeling Nelson Mandela’s party “totalitarian, anti-humane, anti-democratic, anti-Israel, and anti-American”.