Gambling. Excluding gambling information from mails, hearings before subcommittee on bill to amend sec 213 and 215, act of Mar. 4, 1909 (criminal code), relating to offenses against postal service, and sec. 3929 and 4041, Revised statutes, relating to exclusion of fraudulent devices and lottery paraphernalia from mails, and for other purposes, Dec. 9 and 13, 1921.