On December 8, 1983, a child named Dani Katz walked to the street outside his parent's home in the Dania neighborhood of Haifa. He was 14. His parents were Holocaust survivors.
Outside the home, he was kidnapped by a group of Arabs from the Israeli Galilee town of Sakhnin who held jobs in the Dania neighborhood. They took him to a cave near Sakhnin. There they tortured him in the most brutal and horrific way imaginable. They eventually murdered him. After murdering him they sodomized the corpse. They then left him there to rot.
Police unraveled the crime and arrested the five murderers, who confessed and reenacted the crimes.
The lawyer for the accused was far-leftist Avigdor Feldman. Feldman has devoted much of his career to defending terrorists, extremists and traitors. He defended Mordecai Vanunu (nuclear spy), Marcus Klinberg (Soviet spy), Tali Fahima (who did jail time for helping her Palestinian terrorist boyfriend plan atrocities), Teddy Katz (Ilan Pappe's student who fabricated the Tantura massacre), and others.
Some Israeli leftist groups have been rallying support ever since for the murderers (see for example in Hebrew only: here; also anti-Zionist journalist Tom Segev's comments: here)
In 1982 a female soldier named Dafna Carmon was raped and murdered outside her home Two of the murderers of Dani Katz were also convicted of murdering her. They were also represented in that trial by Feldman.
Some Arab Knesset members had been lobbying for the release of the murderers. The "appeals commission" of the Justice Ministry recently recommended that the five murderers have their sentences "shortened." Shimon Peres as President made it official, which means that they will be released from prison within the next few days.
More background on this atrocity: here and here.