The Kennedy Curse?

Reb Yisroel Jacobson

The Kennedy Curse refers to a series of unfortunate events that have happened to the Kennedy family . . .

There are several theories regarding the origin of the "curse". According to Kennedy detractor Edward Klein, there is a story that Joseph Kennedy made his way to the Court of St. James as ambassador in 1937. On a trip back to the United States, aboard an ocean liner that was also carrying a Lubavitcher rabbi named Israel Jacobson and six of his yeshiva students, who were fleeing the Nazis, Kennedy complained to the ship's captain about the distracting noises caused by the Jewish passengers praying on the high holy days of Rosh Hashanah. He demanded that they be forbidden to continue exercises so distracting to fellow passengers. "Rabbi Jacobson put a curse on Kennedy, damning him and all his male offspring to tragic fates."

Source Wikipedia