4According to recital 22 in the preamble to that directive:‘The Treaty allows restrictions to be placed on the right of free movement and residence on grounds of public policy, public security or public health. In order to ensure a tighter definition of the circumstances and procedural safeguards subject to which Union citizens and their family members may be denied leave to enter or may be expelled, this Directive should replace Council Directive 64/221/EEC of 25 February 1964 on the coordination of special measures concerning the movement and residence of foreign nationals, which are justified on grounds of public policy, public security or public health [(OJ, English Special Edition 1963-1964, p. 117), as amended by Council Directive 75/35/EEC of 17 December 1974 (OJ 1975 L 14, p. 14)].’
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