* Algernon D. Black,Algernon D. Black, 92, a retired leader of the Society for Ethical Culture, died in New York Sunday. A liberal social critic, Mr. Black was elected a leader of the society in 1934 and became executive leader in 1943, chairman of the board of leaders in 1945 and senior leader in 1955. He retired from the post in 1973.
* David Blankenhorn,David Blankenhorn, 68, a cardiologist whose research helped establish the link between cholesterol and hardening of the arteries, died of cancer Sunday in Los Angeles. The theory that a low-fat diet and cholesterol-reducing drugs can help those with heart problems emerged from studies Dr. Blankenhorn did in the 1980s on men who underwent heart bypass surgery.