How far would you go (legally of course) to "finish off" problem neighbors??

OK, this question is pretty much based on my own experiences, but is still hypothetical.

If you had a set of problem neighbors on your street -- who had no respect for anyone else; seemed to be acting like a gang, and trying to dominate the street; was doing things that lowered the tone of the street (and were doing this either because they were trying to sabotage the community or were complete morons); inconveniencing you at every turn; thumbing noses at every regulation (bylaw, even some lesser laws) -- how far would you go to get to the point where they finally got the message, gave in, and said "uncle"?

Would you snitch to the tax department (if you knew they were cheating left, right and center)?

Would you hammer them with every conceivable bylaw and law -- calling the fire department, child protection services, animal control, whatever necessary?

Would you hire a detective agency to get all the dirt on one or more of these people?

Would you sue one or more of them -- taking them to court over one or more issue?

Would you just do the detective work yourself, and then confront the neighbors, or engage in a borderline smear campaign?

A few points to remember RE this hypothetical question:

First, you are way more intelligent than this group, and have many more resources than they do. Most of the above options would not even make you break a sweat.

Second, the authorities -- bylaw, the police, etc. -- have done a half-hearted job in dealing with these people, even though they are major scofflaws.

Third, the problem crowd refuses to get the message, seeing you as being in the wrong, and keeps doing things that serious inconvenience, even endanger you.

Fourth, the problem crowd is composed of people who are really Complete Loser types, who are not only poor, dumb, uneducated, with twisted priorities, but who do not even have a basic sense of self-preservation, making them major liabilities to your community.

What would you do?