The JFK conspiracy theroy is just not allowed.

[HooptieWagon]

119. de M was introduced to the Oswalds by the Russian ex-pat community.

de M was a petroleum engineer who did a great deal of foreign travel. Its reasonable to assume such a person might be questioned by CIA on occasion, but that doesn't make him in CIA....no more than being questioned by the cops makes one a policeman.
It is possible that de M was watching Oswald, either by request from the CIA or on his own initiative, and was reporting his observations to the CIA (legally the CIA couldn't conduct domestic surveillence, but they routinely ignored that). It would be interesting to see CIA files inre de M, but I'm not aware of them being released.
It is reasonable to assume de M knew Bush, since both were in the petroleum business living in Dallas. Like de M, Bush probably made reports to CIA. Possibly he had even closer working relationship with CIA.
Oswald was not in the petroleum business, and Bush was not part of the Russian ex-pat community; thus there is little probability of their meeting, and no evidence they knew each other.