Question: At least how many Jews was the unit Joachim Hamann commanded responsible for killing?

Context paragraphs:
1221: (The Jews were falsely accused of a ritual murder.  A crowd stormed the synagogue where the Jews had gathered.  As usual the threat was baptism or death.  The Jewish quarter including the synagogue was razed, many Jews were tortured and killed.  Among the martyrs were Shem Tov ha-Levi, and Rabbi and Mrs. Shmuel Kalonymos, Hy'd.)

Jewish views and involvement in US politics: While earlier Jewish immigrants from Germany tended to be politically conservative, the wave of Eastern European Jews, starting in the early 1880s, were generally more liberal or left-wing, and became the political majority.  Many of the latter came to America with experience in the socialist, anarchist, and communist movements as well as the Labor Bund, emanating from Eastern Europe.  Many Jews rose to leadership positions in the early 20th century American labor movement, and helped to found unions that played a major role in left-wing politics and, after 1936, in Democratic Party politics.  For most of the 20th century since 1936, the vast majority of Jews in the United States have been aligned with the Democratic Party.  Towards the end of the 20th century, and at the beginning of the 21st century, Republicans have launched initiatives to woo American Jews away from the Democratic Party.

Moral Man and Immoral Society: Moral Man and Immoral Society: A Study in Ethics and Politics is a 1932 book by Reinhold Niebuhr, an American Protestant theologian at Union Theological Seminary (UTS) in New York City.  The thesis of the book is that people are more likely to sin as members of groups than as individuals.  Niebuhr wrote the book in a single summer.  He drew the book's contents from his experiences as a pastor in Detroit, Michigan prior to his professorship at UTS.  The book attacks liberalism, both secular and religious, and is particularly critical of John Dewey and the Social Gospel.  "Moral Man and Immoral Society" generated much controversy and raised Niebuhr's public profile significantly.  Initial reception of the book by liberal Christian critics was negative, but its reputation soon improved as the rise of fascism throughout the 1930s was seen as having been predicted in the book.  Soon after the book's publication, Paul Lehmann gave a copy to Dietrich Bonhoeffer, who read it and was impressed by the book's thesis but disliked the book's critique of pacifism.  The book eventually gained significant readership among American Jews because, after a period of considerable anti-theological sentiment among Jews in the United States, many Jews began to return to the study of theology and, having no Jewish works of theology to read, turned to Protestant theological works.

Joachim Hamann: Joachim Hamann (18 May 1913 in Kiel – 13 July 1945) was an officer of the "Einsatzkommando 3", a killing unit of "Einsatzgruppe A", responsible for thousands of Jewish deaths in Lithuania.  Hamann organized and commanded "Rollkommando" Hamann, a small mobile killing unit composed of 8–10 Germans and several dozens of local Lithuanian collaborators.

History of the Jews in 19th-century Poland: Official Russian policy would eventually prove to be substantially harsher to the Jews than that under independent Polish rule.  The lands that had once been Poland were to remain the home of many Jews, as, in 1772, Catherine II, the tzarina of Russia, instituted the Pale of Settlement, restricting Jews to the western parts of the empire, which would eventually include much Poland although it excluded some areas in which Jews had previously lived.  By the late 19th century, over four million Jews would live in the Pale.

History of the Jews in Asti: Asti is a city of about 75,000 inhabitants located in the Piedmont region of northwestern Italy, about 55 kilometres (34 miles) east of Turin, in the plain of the Tanaro River.  It is the capital of the province of Asti.  In the Middle Ages it was an important trade center and the capital of a powerful republic.  Though it is believed that Asti's Jewish community existed as early as the 8th century, it became prominent in the area in the 14th century with the arrival of many Jews expelled from France.  As a result, the Jews of Asti (with the Jews of Moncalvo and Fossano) had their own Jewish ritual rite called APAM and spoke a local dialect of Piedmontese Hebrew.  The Jewish synagogue and cemetery in Asti can still be visited today, as well as the old ghetto, a local Jewish museum and some of the old Jewish homes.  Nowadays, however, the Jewish community of Asti consists of only several Jews, and is branched to the Jewish community of Torino.

History of the Jews in Arles: Arles was a major Jewish center between the Roman times and the Renaissance.  Due to its location between Spain and the rest of Europe, with its proximity to the Mediterranean coast, Arles became a comfortable and sometimes beneficial city for the many Jews who lived in it.  During the Middle Ages, many notable Jews were active in Arles, which functioned as a Jewish philosophy and Arabic-Hebrew-Latin translation center, as it was one of the town known for its Hachmei Provence.  No Jewish community was evident in Arles ever since, even though some evidences of former Jewish life can be seen around town and in the local museum.  The Jewish community ceased to prosper towards the end of the 15th century, until they were expelled in around the 1490s after which they did not return.  Jews were to be found in Arles in the 1960s, though no community was ever evident again.

History of the Jews in Cyprus: The history of the Jews in Cyprus dates back to the 3rd century BC, after trade relations had been established between Cyprus and the Land of Israel.  The Jews had close relationships with many of the other religious groups on the island and were seen favourably by the Romans.  During the war over the city of Ptolemais between Alexander Jannaeus and Ptolemy IX Lathyros, King of Cyprus, many Jews were killed.  During the war the Jewish citizens remained committed in their allegiance to King Lathyros.

Rollkommando Hamann: Rollkommando Hamann (Lithuanian: "skrajojantis būrys" ) was a small mobile unit that committed mass murders of Lithuanian Jews in the countryside in July–October 1941, with a death toll of at least 60.000 Jews.  The unit was also responsible for a large number of murders in Latvia from July through August, 1941.  At the end of 1941 the destruction of Lithuanian Jewry was effectively accomplished by the Rollkommando in the countryside, by the Ypatingasis būrys in the Ponary massacre, and by the Tautinio Darbo Apsaugos Batalionas in the Ninth Fort in Kaunas.  In about six months an estimated 80% of all Lithuanian Jews were killed.  The remaining few were spared as labor force and concentrated in urban ghettos, mainly the Vilna and Kaunas Ghettos.

Antisemitism in Spain: Anti-Semitism in Spain has its roots in Christian anti-Judaism which began with the expansion of Christianity in the Iberian peninsula in times of the Roman Empire and has its first violent manifestation in the brutal persecution of Jews in Visigothic Hispania.  During Medieval times, Jews in Islamic-occupied Spain, Al-Andalus, were designated as "dhimmis", and, despite occasional violent outbursts such as the 1066 Granada massacre, they were granted protection to profess their religion in exchange of abiding to certain conditions that limited their rights in relation to Muslims.  After the Almoravid invasion (11th century), the situation of the Jewish population in Muslim territory aggravated, and during the Almohad invasion of the peninsula many Jews fled to the northern Christian kingdoms, the eastern mediterranean and Africa.

Supporting paragraphs: Joachim Hamann Rollkommando Hamann
Answer: 60.000