他于1970年参加了一些秘密活动。

He joined underground activities in 1970.

在该法令的1888年也已列入障碍的秘密活动。

In the decree of 1888 is also included the impediment of clandestinity.

它的工作重点在于获取外国情报和在海外进行秘密活动。

It's the job of the focus is to obtain foreign intelligence and in secret activities overseas.