WASHINGTON  Erik Prince, whose company, Blackwater Worldwide, is for sale and whose former top managers are facing criminal charges, has left the United States and moved to Abu Dhabi, according to court documents.

Mr. Prince, a former member of the Navy Seals and an heir to a Michigan auto parts fortune, left the country after a series of civil lawsuits, criminal charges and Congressional investigations singled out Blackwater or its former executives and other personnel. His company, now called Xe Services, has collected hundreds of millions of dollars from the United States government since 2001.

Current and former colleagues said Mr. Prince hoped to focus on security work from governments in Africa and the Middle East. They also said he was bitter about the legal scrutiny and negative publicity his company had received.

“He needs a break from America,” said one colleague, speaking only on the condition of anonymity about Mr. Prince’s long-rumored move.