I guess Charles Pierce now qualifies as a "wacko CTer".

[HooptieWagon]

60. "Friendship" is likely a relative term.

Oswald had few or no friends, so likely anyone who said hello and was willing to listen to his political screeds he likely redgarded as a friend. Is there evidence the friendship extended both ways?
More than likely de M was keeping tabs on Oswald for the CIA. Understandable, since Oswald was the sort of unhinged nut the CIA might want to keep tabs on. Understandable the CIA would want to keep that hidden. Firstly, because such domestic spying by the CIA was illegal. Second, because admitting de M was an informant (or more) would endanger the safety and security of his other contacts.
However, since there is no evidence whatsoever that de M aided or abetted Oswald in any way, alleged CIA involvement is extremely tenuous... no more than a cop has conspiratal involvement in a crime committed by one of his street snitches.