Haapalah / Aliyah Bet

At the outbreak of World War II, Yaakov Weiss, who had completed studies at the Hebrew gymnasium in Munkascz, fled to Hungary with his parents.

Yaakov Weiss obtained documents from an Hungarian officer named Georgi Kotisch, enabling him to visit the camps and remove groups of Jews, on the excuse that they were to be tortured.
He saved hundreds of Jews in ghettos of Debrecen, Košice, Eger and Miskolc.
Wikipedia וויקיפדיה cites: Yaakov Weiss masqueraded as SS Officer Georgi Kotisch ג'רג'י קוטיש,

When American planes bombed military buildings, Yaakov Weiss rushed into the building to steal hundreds of passports, which saved Jews from deportation.

Yaakov Weiss' mother and large family were caught on the way to Aushwitz with their false passports.

Yaakov Weiss helped a surviving sister, and then returned to organizing illegal immigration, with the soldiers of the Jewish Brigade whom he had met.

In 1945, Yaakov Weiss moved to Switzerland, and enrolled in university.

Yaakov Weiss was arrested and interned at Atlit Detention Camp, until rescued.

Yaakov Weiss was the fifth arrestee by the British after the Akko Prison attack.

Martin Flectcher cites: Yosef Nechmias was "among the only group ever to escape from thecenturies-old fortess-prison."

Yaakov Weiss, Avshalom Haviv, Meir Nakar were עולי הגרדום "Those hanged on the gallows".
After they were sentenced to death for their role in the Akko Prison Break, ETZL kidnapped two off duty British military policemen, Clifford Martin and Mervyn Paice, in Netanyah.
ETZL announced that hanging the three ETZL members would result in the hanging of the British soldiers.
On July 30, 1947, when the British carried out the death sentences, ETZL carried out their threat.
Clifford Martin and Mervyn Paice were found hung in Netanyah, their bodies booby-trapped with a homemade bomb.