Abstract: A security gate for controlling passage of personnel through an accessway to or from a controlled-access region, the security gate including: (a) a first support structure deployed on a first side of the accessway; (b) a second support structure deployed on a second side of the accessway opposite the first support structure; (c) for each of the first and second support structures, a first set of vertically-spaced elongated barrier elements extending from the support structure in a first barrier formation and a second set of vertically-spaced elongated barrier elements extending from the support structure in a second barrier formation; and (d) a mechanical actuator system deployed so as to synchronously move at least the first and second barrier formations of the first and second support structures such that: (i) the first and second barrier formations assume a first state in which the first barrier formations are spaced apart to allow entrance of a person into the gate from an entrance side while the elongate