Move.
Move.
Goddam no good, lazy, welfare abusing druggie neighbors suck!
Don't move. Get even with the fuckers. Mow your lawn at 7 am Sunday morning after they've been partying all night. Blast the mariachi music or a spanish language radio station LOUD.
Send all their mail to Honolulu. (screw federal regulations, ever hear of any of these identity thieves who steal people's mail actually going to jail?) fuck with their house, fuck with their cars. Call and have their utilities shut off. Pour salt or chemicals on their lawn. (this might not work, freeloading asswipes don't usually own the house they live in, so they don't give a shit what happens to the property)
Call the landlord and complain. Take up a petition with the other neighbors to have their worthless asses thrown out of the neighborhood. Fight fire with fire!
If they come after you, call the cops. Repeatedly. If you have the money, hire a lawyer and sue them AND the landlord. Good Luck.
Move.
THEN fuck with them.