Twenty-two executives and employees working in the private military industry have been arrested in a sting operation accusing them of trying to pay bribes to win lucrative foreign contracts. The FBI says the accused agreed to pay a “commission” to an FBI agent posing as a representative of an African defense minister tendering a $15 million deal. The Justice Department says the case is the largest ever under the Foreign Corrupt Practices Act, which bars the bribery of foreign governments to obtain contracts.