MI5 infiltrated SNP

The interesting question is how much of this is still going on now?

THE SNP was spied on by British secret service agents, previously
classified Government files seen by Scotland on Sunday have finally
proved.

Claims of surveillance of nationalist politicians by intelligence
officers have circulated for years, but the new papers provide the
first incontrovertible evidence that the state spied on the SNP in the
1950s.

Agents from MI5 and Special Branch infiltrated the party as part of a campaign
to undermine support for Scottish independence, the papers show (Scotsman)