I'm sure ... someone else out there can supply you with the reference.
OEC vol 1 page 894, HCO POLICY LETTER OF 29 JUNE 1968 "ENROLLMENT IN SUPPRESSIVE GROUPS"
L. Ron Hubbard wrote:
HCO POLICY LETTER OF 29 JUNE 1968
ENROLLMENT IN SUPPRESSIVE GROUPS
Any person found to be connected to a suppressive group may not thereafter be enrolled in the Saint Hill Solo Audit Course or the Clearing Course.
Suppressive groups are defined as those which seek to destroy Scientology or which specialize in injuring or killing persons or damaging their cases or which advocate suppression of mankind.
It does not matter whether the person so connected disconnects or handles, or whether the connection has been previously severed.
The reason for this policy letter is to make it extremely difficult for suppressive groups to acquire data they could then pervert and use to harm others.
If a person was a member and left, it still remains such a person must have had some basic agreement with the motives of the suppressive group.
If we do not hold this rule, we may find our task made harder by the abuse of data. We do not want, ever again, the epidemics of implantation to recur and will do all in our power to deny data to any who might pervert it to such use.
A person so denied access to upper-level data may not receive it ever unless the group of which he is or has been a member is completely abolished and dispersed.
Ethics files in all orgs must contain the names of such persons.
Neither may such a person ever become a staff member of a Scientology organization without special clearance from LRH Ethics Authority Section, Dept 27, Worldwide. * Anyone on staff found to have been a member of a suppressive group must be sent to this section for clearance.
Names of persons enrolled in SP groups or declared SP must be circulated to all mission holders, Scientology offices and orgs as and when discovered. They are not covered by any amnesty and may not have Advanced Courses until group disbanded. Such persons may not be employed by orgs or offices and if found employed in any center that mission charter will be cancelled. Persons of SP group membership or declared SP may not be FSMs.
L. RON HUBBARD