Employees of the MMS, an agency of the Interior Department, "socialised with, and received a wide array of gifts and gratuities from, oil and gas companies," according to the department's inspector general, Earl Devaney.
"When confronted by our investigators, none of the employees involved displayed remorse," Devaney said.
The alleged activities occurred between 2002 and 2006 and involved 19 former and current workers at the MMS's offices in Denver and Washington.
