Forgery: Endorsement of Government Check 18 U.S.C. Sec. 510(a)(1) is the crime of signing or affixing a false signature or endorsement to a government check, with the intent to deceive or defraud another person or the government. This type of forgery is specifically outlined in the United States Code, Title 18, Part I, Chapter 25, Section 510(a)(1). There are two main types of forgery related to government checks. The first is the signing or affixing of a false signature or endorsement to a government check, without the authorization of the owner of the check. The second is the signing or affixing of a false signature or endorsement to a government check, with the intent to deceive or defraud another person or the government. Both types of forgery are punishable under 18 U.S.C. Sec. 510(a)(1).