The U.S. attorney's office says 28-year-old Dianna Perez and 29-year-old Randy Littlefield were charged with conspiracy on Tuesday and entered their pleas.
According to prosecutors, Perez cleared drug couriers' bags about nine times, and Littlefield cleared them at least twice. Authorities say 24-year-old Millage Peaks paid the security workers between $200 and $500 for each bag containing marijuana that they cleared through security.
Prosecutors say Perez and Littlefield began taking bribes in November 2010.
Peaks, who is the son of a former Los Angeles fire chief, also pleaded guilty to conspiracy charges on Tuesday. Two other smugglers have pleaded guilty to similar charges in the case.
The Associated Press contributed to this report.