Aggressive Stray Dog Issue. Any mess.

There are two stray dogs in my area who have become a real danger threat to cats and humans. I am a animal lover and i rescue and foster cats and dogs. These two dogs have killed more than 20+ cats and 30+ puppies of other dogs. I personally have lost 4 cats of mine bcoz of these bloody merciless dogs. Never in my life have i ever seen such brutal dogs. I contacted local authorities and professional animal rescuers bt they also couldn't catch them. They have suggested that the only way to end this menace is to take down those two dogs. I also have lost my patience and kindness on these two dogs. I have been trying to calm them down since the last 4 years infact after losing personally my own pet dogs. They have bite more than 6 kids as of now. Plz prescribe me a posion tablet which I can put inside chicken leg and feed them and take them down without creating any mess.