A "Newsweek" investigation alleges that one of Guzmán's techniques for maintaining his dominance among cartels included giving information to the DEA and U.S. Immigration and Customs Enforcement that led to the arrests of his enemies in the Juárez Cartel, in addition to information that led to the arrests of some of the top Sinaloa leaders. The arrests were speculated by some to have been part of a deal Guzmán struck with Calderón and the DEA, in which he intentionally gave up some of his purported Sinaloa colleagues to U.S. agents in exchange for immunity from prosecution, while perpetuating the idea that the Calderón government was heavily pursuing his organization during the cartel crackdown.