JERUSALEM — Senator Bernie Sanders volunteered on an Israeli kibbutz in the 1960s, but he has always been vague about the specific location. Now, the mystery about the Democratic presidential candidate’s past appears to have been solved, in the archives of the Israeli newspaper Haaretz.

Yossi Melman, a longtime Haaretz writer, remembers an interview he did with Mr. Sanders in 1990, the year he was elected to represent Vermont in the House. Haaretz dug up that clip, in which Mr. Sanders said he had spent several months in 1963 working on Kibbutz Sha’ar Ha’amakim, near Haifa in northern Israel, as a guest of the Hashomer Hatzair youth movement.

The movement, whose Hebrew name translates to “The Young Guard,” was a socialist, Zionist secular Jewish youth group founded in 1913 in Galicia, Austria-Hungary, and shared the name of a workers’ party in pre-1948 Palestine. The original 1990 article was titled “The First Socialist” and said that after spending time on the kibbutz with his wife at that time, Mr. Sanders seems to have lost his connection “to Israel, Zionism and Judaism,” Haaretz reported this week. Mr. Sanders has long described himself as a democratic socialist.

Kibbutz members interviewed this week by Israeli and American Jewish news organizations said they did not remember Mr. Sanders specifically.

“The only thing I remember is that we had around 100 volunteers here, and some of them were French and some were American,” Albert Ely, who is 79 and once managed the orchard, told The Forward, a New York-based Jewish newspaper. “And someone named Bernard was an American. Usually Bernard is a French name.”

Israel’s Kibbutz Movement — the umbrella organization for the 250 communal settlements — had begun a Facebook campaign to find out where Mr. Sanders stayed. Mr. Sanders’ brother, Larry, who recently failed in his bid for the British Parliament, also spent time on two communal farms, in Kibbutz Matzuva (in western Galilee) and Kibbutz Yotvata (in the southern Negev), Haaretz reported.

Mr. Ely said that on Sha’ar Ha’amakim, “you care about your brother or your neighbor or whoever it is.” The kibbutz was founded in Romania in 1929 and established in pre-state Israel in 1935. It saw the Soviet Union as a model, and often flew the red flag at outdoor events. Volunteers like Mr. Sanders would have internalized a political imperative to improve the lot of other, Mr. Ely said.

“I know that we left an imprint on those people,” Mr. Ely said. “The imprint was believe in people, and be responsible for them. Not only for yourself.”

Today, the kibbutz gets most of its income from a factory that makes solar water heaters, but the members still farm and tend cows.

Dudu Haver, 83, the former kibbutz volunteer coordinator, told The Forward that volunteers would work for six hours in the morning, usually in agriculture, and then partake in cultural events in the afternoon.

“We’ll be glad to host Bernie Sanders here again on the kibbutz,” he said.