Any way to remove test miners from the board?

Oleg Vasilenko (Chelyabinsk) - https://acm.timus.ru/status.aspx?space=1&num=1589&author=55499&from=10681678

Ruben Ashughyan - https://acm.timus.ru/status.aspx?space=1&num=1589&author=202317&from=10649282

kostan3 - https://acm.timus.ru/status.aspx?space=1&num=1589&author=121982 (looks suspicious, is it a system account or something?)