ALDF, the Animal Legal Defense Fund, is a charitable organization dedicated to fighting for animals within the legal system. They offer briefs and legal assistance to prosecutors and law enforcement agencies which might otherwise be too overwhelmed to take cases on. They file lawsuits against puppy mills, abusive breeders, and animal hoarders to try to rescue animals in deplorable conditions. And, they assist individual lawyers pursuing cases about animals in the legal system. They even have a small grant program for individual cases to assist in defraying legal costs.
The ALDF website contains useful news and information about cases around the country involving animals, both criminal and civil. I have found ALDF to be a very useful and informative organization and they are efficient with their donations, so I continue to support them year after year.
They don't seem to get nearly as much press as Best Friends or the Humane Society, yet they are doing a great deal on behalf of animals. So, if you aren't already familiar with them, I encourage you to check out their website and learn more.