The Holocaust

FILE - In this file photo from May 2, 2013, a visitor looks at a poster of the former Nazi concentration camp of Mauthausen during a press preview in a new memorial room at the former camp in Mauthausen, Austria. The concentration camp was liberated by U.S. troops on May 5, 1945. A new survey released on Thursday, May 2, 2019, has found that many Austrians lack basic knowledge of the Nazi genocide, even though the notorious Mauthausen concentration camp was just outside of the city of Linz, and some of the key perpetrators of the Holocaust were Austrian. (AP Photo/Ronald Zak, File)

File - In this Sunday, Dec. 2, 2018 file photo, a menorah is installed outside the Tree of Life Synagogue in preparation for a celebration service at sundown on the first night of Hanukkah, in the Squirrel Hill neighborhood of Pittsburgh. A gunman shot and killed 11 people while they worshipped Saturday, Oct. 27, 2018 at the temple. Israeli researchers reported Wednesday that violent attacks against Jews spiked significantly last year, with the largest reported number of Jews killed in anti-Semitic acts in decades, leading to an "increasing sense of emergency" among Jewish communities worldwide. (AP Photo/Gene J. Puskar, File)

People look on floating handmade boats with the names of Nazi concentration camps, during a ceremony marking the annual Holocaust Remembrance Day in Hayarkon park in Tel Aviv, Israel, Wednesday, May 1, 2019. Israel marking the annual Day of Remembrance for the six million Jewish victims of the Nazi genocide who perished during World War II. Hebrew reads "to remember". (AP Photo/Oded Balilty)

This photo shows a 13-year-old Eva Heyman photographed in Hungary months before she was murdered in a Nazi concentration camp in 1944. An Instagram account based on Heyman’s real-life journal is generating buzz as an innovative way to share Holocaust testimony with youth, as global understanding of the genocide declines and the community of eyewitnesses dwindles. (Yad Vashem via AP)

Attendees at the funeral for Lori Kaye, who was killed Saturday when a gunman opened fire inside the Chabad of Poway synagogue in Poway, Calif., pass by a photo of Kaye, Monday, April 29, 2019 inside the synagogue. (AP Photo/Gregory Bull)

FILE - This Aug. 31, 2017, file photo, shows a sign for Middlebury College on the campus in Middlebury, Vt. A Middlebury College chemistry professor whose written exam question asked students to calculate the lethal dose of a poisonous gas used in Nazi gas chambers during the Holocaust has taken a leave of absence, the school said. (AP Photo/Wilson Ring, File)

Democratic presidential candidate and former Texas congressman Beto O'Rourke speaks during a campaign event in Sioux City, Iowa, on Thursday, April 4, 2019. (Justin Wan/Sioux City Journal via AP)

Portraits of Holocaust survivors are displayed at the Museum of Jewish Heritage as a vintage German train car, like those used to transport people to Auschwitz and other death camps, is uncovered on tracks outside the museum, in New York, Sunday, March 31, 2019. The train car joins hundreds of artifacts from Auschwitz at the museum for an exhibit entitled "Auschwitz. Not long ago. Not far away," that opens to the public on May 8. (AP Photo/Richard Drew)

FILE - In this file photo dated Tuesday, April 20, 2011, members of German hard rock band Rammstein, with Till Lindemann, right, and Christoph Schneider accept the award for Best Live Band at the 3rd Annual Revolver Golden Gods Awards ceremony in Los Angeles, USA. Jewish groups and the Israeli government on Thursday March 28, 2019, criticized Rammstein for a video promoting the release of its new single that features band members dressed as concentration camp inmates standing on a gallows.(AP Photo/Chris Pizzello, FILE)

Joined by Newport Harbor High School Principal Sean Boulton, left, Eva Schloss, the stepsister of Anne Frank and a Holocaust survivor, talks to reporters during a news conference Thursday, March 7, 2019, in Newport Beach, Calif. Schloss met Thursday with Southern California high school students who were photographed giving Nazi salutes around a swastika formed by drinking cups at a party. Schloss said the students apologized for their behavior and indicated they didn't realize what it really meant. (AP Photo/Jae C. Hong)