[14] Since 2003, Darshan-Leitner and a team of lawyers have worked with hundreds of terror victims in lawsuits[15] and legal actions against Hamas, the Palestinian Authority, Iran and Syria.

[19] Darshan-Leitner rejected the finding and demanded, under Australia's Freedom of Information Act that AUS Aid and World Vision turn over details of the investigation.

[20] In May 2008, Shurat HaDin was co-counsel in filing in Manhattan Federal Court against Swiss mega bank UBS GA[21] which is accused by the plaintiffs of financing terror.

In July 2008, the Center joined with Montreal-based attorney Jeffrey Boro and Professor Ed Morgan of the University of Toronto's International Law and Counter-Terrorism Project to file a civil action by Canadian victims of Hizbollah.

On July 14, 2008, Darshan-Leiter and Attorney Robert Tolchin of New York filed a civil action on behalf of victims of the Hizbollah against an American Bank.

In February 2011, Darshan-Leitner and David Schoen filed a $5m lawsuit against former US President Jimmy Carter, alleging that his book, Palestine: Peace not Apartheid, "intentionally misleads and misrepresents about actual historic events", contrary to New York state law against deceptive business practices.

[25] In June 2014, Darshan-Leitner filed a writ in the United States District Court in Washington, D. C., seeking seizure of the web domains belonging to the Islamic Republic of Iran to compensate victims of Iranian sponsored terrorism.

In September 2020, and after pressure from Israeli and Jewish lobby groups including Shurat HaDin,[35] the US-based firm Zoom Video Communications, developer of the video teleconferencing app Zoom canceled a webinar that was to be held at San Francisco State University featuring Leila Khaled, a member of the Popular Front for the Liberation of Palestine who took part in two plane hijackings in 1969 and 1970.

On May 1, 2008, Darshan-Leitner along with former Soviet Ida Nudel launched a public campaign to save the life of a Palestinian police officer accused of having assisted the Israeli intelligence services in hunting down fugitive terrorists.

Sa'ad, it is alleged, provided the Israel Defense Forces with the whereabouts of four suspected bomb makers whom the Palestinian Authority was unwilling to hand over to the Israelis.

"The Temple Mount", one of the holiest sites in the Muslim world and home of the Al-Aqsa mosque, "is the property of Jewish nation and has been for thousands of years", claimed Darshan-Leitner.