Related Rule
Belgium
Practice Relating to Rule 129. The Act of Displacement
Belgium’s Law concerning the Repression of Grave Breaches of the Geneva Conventions and their Additional Protocols (1993), as amended in 1999, criminalizes as a grave breach the “unlawful deportation [or] transfer” of protected persons. 
Belgium, Law concerning the Repression of Grave Breaches of the Geneva Conventions and their Additional Protocols, 1993, as amended in 1999, Article 1(3)(6); see also Article 1(2)(1) (forcible transfer of children to another group as a part of a genocide campaign).
Belgium’s Penal Code (1867), as amended in 2003, provides:
A crime against humanity, as defined below, whether committed in time of peace or in time of war, constitutes a crime under international law and shall be punished in accordance with the provisions of the present title. In accordance with the Statute of the International Criminal Court, crime against humanity means any of the following acts when committed as part of a widespread or systematic attack directed against any civilian population, with knowledge of the attack:
4. deportation or forcible transfer of population. 
Belgium, Penal Code, 1867, as amended on 5 August 2003, Chapter III, Title I bis, Article 136 ter, § 4.
The Penal Code further states:
War crimes envisaged in the 1949 [Geneva] Conventions … and in the [1977 Additional Protocols I and II] … , as well as in Article 8(2)(f) of the [1998 ICC Statute], and listed below, … constitute crimes under international law and shall be punished in accordance with the provisions of the present title … :
9. the unlawful deportation, transfer, or displacement … of a civilian protected by the [1949 Geneva] Convention [IV] on the protection of civilians in times of armed conflict, or a person protected by [1977] Additional Protocols I and II to the … 1949 Geneva Conventions. 
Belgium, Penal Code, 1867, as amended on 5 August 2003, Chapter III, Title I bis, Article 136 quater, § 1(9).
Belgium’s Law relating to the Repression of Grave Breaches of International Humanitarian Law (1993), as amended in 2003, provides:
A crime against humanity, as defined below, whether committed in time of peace or in time of war, constitutes a crime under international law and shall be punished in accordance with the provisions of the present title. In accordance with the Statute of the International Criminal Court, crime against humanity means any of the following acts when committed as part of a widespread or systematic attack directed against any civilian population, with knowledge of the attack:
4. deportation or forcible transfer of population. 
Belgium, Law relating to the Repression of Grave Breaches of International Humanitarian Law, 1993, as amended on 23 April 2003, Article 1 bis, § 4.
The Law further states:
War crimes envisaged in the 1949 [Geneva] Conventions … and in the [1977 Additional Protocols I and II] … , as well as in Article 8(2)(f) of the [1998 ICC Statute], and listed below, … constitute crimes under international law and shall be punished in accordance with the provisions of the present title … :
6. the unlawful deportation, transfer, or displacement … of a civilian protected by the [1949 Geneva] Convention [IV] on the protection of civilians in times of armed conflict, or a person protected by [1977] Additional Protocols I and II to the … 1949 Geneva Conventions. 
Belgium, Law relating to the Repression of Grave Breaches of International Humanitarian Law, 1993, as amended on 23 April 2003, Article 1 ter, § 1(6).