Besides her work as a union organizer, De La Cruz taught English to migrant workers and served on the executive board of the California Rural Legal Assistance, which provides legal services.
Friends and family say De La Cruz was known for her humility and devotion to improving the lives of farmworkers. Even in her 90's, De La Cruz would often ask to be taken to political rallies.
Her life has been documented in books, news articles and in a 1998 miniseries titled, "A Will of Their Own."
"Jessie De La Cruz was an icon of the farm worker movement," the UFW said in a statement. She "embodied Cesar Chavez's conviction that ordinary people have within them the ability to do extraordinary things."