"The repatriation of fugitives to their home countries" 可以表达“亡命者送还本国”这一含义。其中,“repatriation” 意为“遣返;送回本国”;“fugitives” 指“逃亡者;亡命者” ;“to their home countries” 明确了送还的目的地是他们的本国。
如果更强调执行这一行为的主体(比如政府、机构等),也可以说 “The government/organization repatriates fugitives to their home countries” 。