“厉行纪律的人”可以翻译为 "a person who strictly enforces discipline" 或 "a disciplined individual who adheres rigorously to rules"。
"a person who strictly enforces discipline" 强调该人积极、严格地执行纪律。
"a disciplined individual who adheres rigorously to rules" 则侧重于描述该人自身具有高度的纪律性，并严格遵守规则。
根据具体语境和想要表达的重点，可以选择其中一种或进行适当调整。