Chiang's whole career had been a struggle against the intervention in his well-ordered chain of events of that disturbing imperative which he called the mob.

the intervention in his well-ordered chain of events of that disturbing imperative

这个名词词组是由一个句子压缩而成的。原句为：

that disturbing imperative intervened in his well-ordered chain of events.

intervene为不及物动词，与介词in搭配表示干预、干扰某事。in介词短语为状语。

动词intervened改为名词intervention, in介词短语修饰名词intervention为定语，原来的主语由介词of引出，也是intervention的定语，表示主谓关系。

which引导定语从句，修饰imperative, which在从句中作宾语。其逻辑关系为：

he called the imperative the mob.

我觉得这个定语从句的逻辑有些问题。imperative意为需要紧急处理的事情。将需要紧急处理的事情称为暴民，这不太符合逻辑。所以我认为定语从句应改为：

which he thought to be the mob. 这样，定语从句的逻辑为，他认为需要紧急处理的事情是暴民。