well I think they fit in the definition here very well.
http://www.mcafee.cc/Bin/sb.html
no idea on the credibility of that link though and admittedly quite a few of the self proclaimed left wingers do as well, just because they sit on one side or the other doesn't define what they are.
How about using a decent definition?
A) There is a pervasive pattern of disregard for and the rights of others occurring since the age of 15, as indicated by three (or more) of the following:
failure to conform to social norms with respect to lawful behaviors as indicated by repeatedly performing acts that are grounds for arrest;
deceitfulness, as indicated by repeatedly lying, use of aliases, or conning others for personal profit or pleasure;
impulsivity or failure to plan ahead;
irritability and aggressiveness, as indicated by repeated physical fights or assaults;
reckless disregard for safety of self or others;
consistent irresponsibility, as indicated by repeated failure to sustain consistent work behavior or honor financial obligations;
lack of remorse, as indicated by being indifferent to or rationalizing having hurt, mistreated, or stolen from another.
B) The individual is at least 18 years of age.
C) There is evidence of Conduct disorder with onset before age 15.
D) The occurrence of antisocial behavior is not exclusively during the course of schizophrenia or a manic episode.
DSM IV-TR
Doesn't sound very accurate, does it?