LZ 129 Hindenburg and sister-ship LZ 130 Graf Zeppelin II were German airships, called zeppelins. The two had an impressive safety record: the Graf Zeppelin had flown safely for more than 1 million miles, and made the first circumnavigation of the globe. The controversy relates to the cause of the fire in such a safe aircraft. The cause is still unknown and theories persist that the fire was sabotage.
One of several theories is that Adolf Hitler ordered the destruction of the Hindenburg in retaliation for the Zeppelin company's openly anti-Nazi stance. Another theory is that Zionist agents working against anti-semitic Germany were behind the fire.
Say what? I just quickly Googled through the seamy underbelly of the web and didn't find any such theory anywhere.
But I'm sure we will start seeing it now!