- Animal Welfare Institute64
- Stevens, Christine54
- American Society for the Prevention of Cruelty to Animals48
- Society for Animal Protective Legislation33
- Royal Society for the Prevention of Cruelty to Animals26
- American Society for the Prevention of Cruelty to Animals -- Legal cases25
- United States. Congress24
- Bergh, Henry, 1811-188812
- Massachusetts Society for the Prevention of Cruelty to Animals10
- United States. Department of Agriculture10
- American Humane Education Society9
- Carter, Jimmy, 1924-6
- American Veterinary Medical Association4
- Humane Society of the United States4
- National Anti-Vivisection Society4
- American Humane Association3
- Regan, Tom3
- Francione, Gary L. (Gary Lawrence), 1954-2
- Gandhi, Mahatma, 1869-19482
- Lopez, Isaac2