instruct + that

[Molly]

Does the second that sound OK, here?

"I do not feel that I should have to instruct even junior typists that my documents, all my documents, are entirely confidential."

I was wondering about the collocation of instruct + that.

[Nessie]

Here is what I found on my OALD and Longman Dictionary of Contemporary English:

OALD:
instruct
verb
(formal) to tell sb to do sth, especially in a formal or official way: [VN to inf] The letter instructed him to report to headquarters immediately. ◆ [VN wh-] You will be instructed where to go as soon as the plane is ready. ◆ [VN] She arrived at 10 o'clock as instructed. ◆ [V that] He instructed that a wall be built around the city.

Longman Dictionary of Contemporary English:
instruct
in·struct /ɪnˈstrʌkt/ v [T]
[Date: 1400-1500; Language: Latin; Origin: , past participle of instruere, from struere 'to build']
to officially tell someone what to do

instruct (sb) that
　The judge immediately instructed that Beattie be released.
　Eva went straight to the hotel, as instructed (=as she had been told)

=> So, the structure "instruct... that..." does exist, but I think it's not very suitable in your sentence (it doesn't refer to "tell someone what to do")
Just my two cents
Nessie.
_________________
... something we never have again, I know... I guess I really really know..

Sorry seems to be the hardest word...

[Molly]

It's OK then. Thanks, Nessie (girl).