German court blocks release of secret files on Nazi Holocaust mastermind Adolf Eichmann which would reveal how western spies knew where he fled after the war It vetoed a bid to open up classified files on the Holocaust organiser The files are also thought to contain details about his spectacular kidnapping Ruled intelligence agency was within its rights to black out passages Evil to the core: Adolf Eichmann was the chief organiser of the Nazi extermination programme Germany's foreign intelligence agency can keep secret some of its records on Adolf Eichmann, the man known as the mastermind behind the Nazi Holocaust, a court ruled today. It vetoed a bid to open up classified files which would reveal how western spies knew where the killer of six million Jews had fled to after the Second World War. Eichmann was the chief organiser of the Nazi extermination programme - from his office at Gestapo headquarters in Berlin he organised the railway transports that took six million Jews to their deaths. The files are also thought to contain details about his spectacular kidnapping - perhaps even collusion between Israel and West Germany - in pulling it off. The Federal Administrative Court ruled that the intelligence agency was within its rights to black out passages from files sought by a journalist. Thursday's ruling followed a decision last year in which the court said the Federal Intelligence Service had to release some material it had previously kept secret. Israeli Mossad agents abducted Eichmann in Buenos Aires in 1960 and took him to Jerusalem for trial. Eichmann - in charge of the deportations of Jews across Europe - was found guilty of war crimes, sentenced to death and hanged in 1962. The mass-circulation Bild daily, whose reporter sued for the files' full release, has reported that West German intelligence knew as early as 1952 that he was in Argentina. There has long been a suspicion in Germany that the post-war Adenauer government wanted to prevent his capture in case he revealed highly embarrassing details about the Nazi pasts of high-ranking figures in the West German government, judiciary and civil service. Distributing: Nazi leader and war criminal Adolf Eichmann (second right) smiling while German officers cut a Jewish prisoner's hair locks in the Bergen-Belsen concentration camp Architect: From his office at Gestapo headquarters in Berlin Eichmann organised the railway transports that took six million Jews to their deaths In 2006, the CIA released documents showing that it contacted West German intelligence officers in 1958, claiming it had information that Eichmann 'is reported to have lived in Argentina under the alias 'Clemens' since 1952' - both his correct whereabouts and only a slightly different alias. He actually went by the name of Ricardo Klement. The German intelligence service said most of the files on Eichmann are 'already public' and only a small portion still needs to be blacked out. It said that the need to do so stems from laws on 'protecting state security interests' and data protection laws. A lawyer for Bild said it reserved the right to take the case to Germany's highest court. Christoph Partsch said in a statement that Germany's interests would be 'harmed by redacting the files, not by releasing them.' War crimes: Adolf Eichmann pictured in the box during his trial at the Jerusalem Supreme Court in Tel Aviv Fled: The aging cardboard passport used by Adolf Eichmann. He fled to Argentina in 1950 under the alias as 'Ricardo Klement' with a passport issued by the Red Cross Insight: A page from the diary of Adolf Eichmann - he wrote the lengthy diary in prison after he was nabbed in Argentina by Israeli secret agents and brought to Israel to stand trial for crimes against humanity The documents may also contain information about Eichmann's abduction and possible cooperation between Israel and Germany. Attorneys representing Germany's intelligence service claim some of the data in the files was obtained by a foreign intelligence agency and argued that exposing it could damage ties with intelligence organizations of other nations. Eichmann was once interviewed in Buenos Aries during his long years as a fugitive by an extreme neo-Nazi journalist. In the interview he claimed he would go to his grave a happy man knowing that he had caused the deaths of millions of Jews. At his trial he was famously branded the ultimate example of the 'banality of evil' as he came across as a finicky little bureaucrat with no conscious; just a man who claimed he was obeying orders from higher authorities.