A college professor and his wife in Florida have been accused of spying for Cuba for decades.

In an indictment made public Monday in Miami, prosecutors said 61 year-old Carlos Alvarez and his 55 year-old wife Elsa had been sending to Cuba information on U.S. government officials and anti-Castro exile groups. Prosecutor Brian Frazier said Carlos began spying for Cuba in 1977, and Elsa began in 1982.

Frazier said the couple used short wave radio and encryption equipment to send messages to Cuba. An agent for the Federal Bureau of Investigation said there was no evidence they provided classified or military information to Cuba.

The couple was employed at Florida International University. The judge in the case ordered them held without bail and scheduled another hearing for January 19.

Some information for this report was provided by AP, and Reuters.