A former proponent of the use of direct action to end what he sees as cruelty to animals and destruction of the environment, Coronado was jailed in 1995 in connection with an arson attack on research facilities at Michigan State University. The incident, which caused $125,000 worth of damage and destroyed 32 years of research data, was part of the Animal Liberation Front's "Operation Bite Back," a series of attacks on animal-testing and fur facilities in the United States during the 1990s.