Barack Obama's special envoy against antisemitism lavished praise on the Community Security Trust when addressing its annual dinner in London.
Hannah Rosenthal said the CST's work in recording and analysing antisemitic incidents was invaluable to American agencies dealing with hate crime.
"Our reports are as comprehensive as they are because we rely on our diplomats, on our ambassadors, across the world," she told the 1,200 guests, including Cabinet members Ed Balls and John Denham. "But we also rely on non-governmental organisations. When we report on the UK, we count on CST for their data, which shows the important work that this group does, much of it seen, but some of it not seen at all.
"I want to applaud your work, not only in protecting members of the Jewish community in the UK, but in sharing your best practices with other groups, working with members of other vulnerable communities that have been or could be targets as well."
Another speaker was Metropolitan Police Deputy Commissioner Tim Godwin, a late replacement for Commissioner Sir Paul Stephenson, who was in Australia for a counter-terrorism conference.
He highlighted the close working relationship between the police and the CST, particularly during last year's anti-Israel demonstrations over Gaza.
Olympics Minister Tessa Jowell and 30 senior police officers from around the country were also at the dinner.