b. Probation was illegalization of the sale of alcohol in the U.S. This was caused by the WCTU. It was passed as the 18th constitutional amendment in 1919 and was later repealed by the 21st constitutional amendment in 1933. | b. Probation was illegalization of the sale of alcohol in the U.S. This was caused by the WCTU. It was passed as the 18th constitutional amendment in 1919 and was later repealed by the 21st constitutional amendment in 1933. |