Israeli filmmakers Yuval Abraham and Rachel Szor made a documentary, NAZA, that accuses the Israeli army of systematic mass civilian killings in Gaza.
NAZA won the Special Jury Prize at the Venice International Film Festival, and was met with a 25-minute standing ovation.
Critics in Israel have seen the film as an act of treason and it has prompted calls from the government for a secret-service investigation into the filmmakers and the soldiers who spoke to them.
A documentary revealing how Israel's military has waged a fatal campaign in Gaza has prompted an opposition, with protesters accusing the filmmakers of "treason".
The film's title comes from an Israeli military acronym derived from the Hebrew term "nezek agavi", or "collateral damage".
Not now publicly available in any country, and kept secret just days before its release at the Venice International Film Festival, the few clips circulating of the film have caused an objections in Israel.
Prime Minister Benjamin Netanyahu said he would promote legislation against the defamation of Israeli soldiers and the State of Israel, which he called the NAZA laws.
Abraham said he and Szor had felt a responsibility as Israelis to use their position and ability to gain confidence and bring "insider testimony into how the system looks like from the inside, the system of killing".
The pair have not yet returned to Israel since its Venice screening and the opposition has been so intense Abraham has deleted his social media accounts.
Israel's Minister of Culture, Miki Zohar, said he had approached David Zini, the head of Israel's internal secret service, and called for an investigation to be opened against Abraham and Szor.