apportion means to "make a portion for", as in "to give you your portion (of justice)". it's not negative, it's synonymous with "administer justice" or "make/deliver a ruling". although it's probably not a 1-for-1 translation (exact translation), I think it may be similar to 予以制裁, in usage. 有些有權力的人 （？） ［予以制裁］了。 (?) apportion |əˈpôr sh ən| verb [ trans. ] divide and allocate : voting power will be apportioned according to contribution. • assign : they did not apportion blame or liability to any one individual. ORIGIN late 16th cent.: from Old French apportionner or medieval Latin apportionare, from ad- ‘to’ + portionare ‘divide into portions.’

"apportion justice" is to distribute or allocate justice proportionally In the sentence you provided, it appears it is being used in a positive sense, suggesting that those in power are distributing justice fairly.