The Denver Post said 41 suspects have been indicted, with 19 suspected of violating the Colorado Organized Crime Control Act.
Two brothers, Alfonzo Elias Castro, 31, of Denver and Aaron Noah Castro, 29, of Commerce City, Colo., were kingpins in an operation in which women were used as mules for drug deliveries and first-edition Batman and Superman comic books were used to hide drug profits, the newspaper said.
"To launder the money, you have to have something you can use that is quick and convenient," Colorado Attorney General John Suthers said. "And in this case, they used classic comic books."
The drug operation -- dismantled Aug. 14 after a yearlong undercover effort -- was associated with extensive illegal narcotics trade that contributed to the deaths of 2,000 police officers in Mexico last year, the newspaper said.
With the exception of one Mexican national, the suspects are U.S. citizens, Suthers said.