Wow. Whenever Israel comes up, it's always "Never attribute to your own ignorance what can be explained by the involvement of Mossad."
In Maxwell's case, he was working with too many different countries to be totally loyal to one in particular. He was semi-famous for publishing translations of awful hagiographies of communist dictators in the 80's (and of censoring other books as a favor to friends).
http://en.wikipedia.org/wiki/Robert_Maxwell#Death