It has long been suspected that Russia has deliberately concealed information on the fate of Raoul Wallenberg, the courageous Swedish diplomat who rescued thousands of Hungarian Jews during the Holocaust.

Wallenberg was arrested in Budapest after Soviet troops entered the city in 1945 and never seen again.

The Soviet Union claimed alternatively that he had died or had been executed shortly afterwards. Former Soviet prisoners testified that they saw him alive during the 1980s when he was merely identified by number rather than by name.

Additional proof  has now surfaced that the Russians have been less than candid. A researcher conducting a study on the KGB's SMERSH (death to spies) counterespionage organization located material detailing the interrogation of Willy Rodel, a German POW who shared a cell with Wallenberg in Moscow's infamous Lefortovo prison.

The material shows that the FSB, the KGB's successor, deliberately suppressed 57 pages from the Rodel file and then denied having it.

The researchers are certain that those and other papers in the file had information on Wallenberg and could shed light on his fate.