someone who commits sabotage or deliberately causes wrecks
<noun.person>
a member of a clandestine subversive organization who tries to help a potential invader
<noun.person>
The Review blames a saboteur and has Hanover police investigating.
Scotland Yard has launched an international hunt for the high-tech saboteur who sent at least 10,000 tampered disks to individuals and institutions worldwide, officials said Monday.