After the settlement into a uniform format size in 1928, cardboard punched cards became a major form of data storage. Punched cards were already widely in use to accumulate data for civil and military purposes such as the 1890 US Census. Because of their technical importance, espionage agencies from several countries founded research groups to corrupt this data through early intelligence interventions. A common strategy was the use of the common Book or Paper Louse, which naturally digests the cellulose within paper or cardboard. At the time computational centers were mainly maintained by female workers, which resulted in countless products for women, designed to secretly deploy eggs and larvae of the insects inside the fragile data centers of the early 20th century.