Very well funded and full of bright people with good PR and government contacts. This was a professional effort all the way.
I think they were called the "AUM" OR "ALUM" or somethign like that and they were led by a blind "shiek" A search on google for the "Tokyo Subway Attack" should give you a bunch more info about them.
They tried bio-weapons forever, to the point of absurdity.. then switched to sarin gas (I think) for the subway attack and that's finally what did the trick.