JERUSALEM — Denouncing Israel’s treatment of Palestinians under occupation, a group of veterans from an elite, secretive military intelligence unit have declared they will no longer “take part in the state’s actions against Palestinians” in required reserve duty because of what they called “our moral duty to act.”

In a letter sent Thursday night to their commanders as well as Israel’s prime minister and army chief, 43 veterans of the clandestine Unit 8200 complained that Israel made “no distinction between Palestinians who are and are not involved in violence” and that information collected “harms innocent people.” Intelligence “is used for political persecution,” they wrote, which “does not allow for people to lead normal lives, and fuels more violence, further distancing us from the end of the conflict.”

The letter, revealed Friday in Israel’s Yediot Aharonot newspaper as well as The Guardian in Britain, echoes similar periodic protests by reservists over the years, including a group of 27 pilots who refused to participate in what Israel calls targeted assassinations, and 13 members of the vaunted commando unit known as Sayeret Matkal, both in 2003. But it is the first public collective refusal by intelligence officers rather that combat troops. Unit 8200 has a special role in Israeli society as a coveted pipeline to its high-technology industry.

“After our service we started seeing a more complex picture of a nondemocratic, oppressive regime that controls the lives of millions of people,” said one of the group’s organizers, a 32-year-old sergeant major who was on active duty from 2001 to 2005. He spoke on the condition of anonymity because the military prohibits Unit 8200 members from being publicly identified.