Retired #spycops officer HN106 alias "Barry Tompkins" was deployed between 1979 and 1983.

He infiltrated the Spartacist League of Britain & Revolutionary Communist Group among others, and even founded his own faction, the "Revolutionary Labour League": https://splitsandfusions.wordpress.com/2018/03/29/revolutionary-labour-league-1980/

Nearly recruited by the USSR and accused of at least one possible relationship with an activist, his reports were some of the most odious, containing explicit personal details of his targets. Read more about him here:
https://powerbase.info/index.php/Barry_Tompkins_(alias)
&
http://campaignopposingpolicesurveillance.com/2021/05/14/ucpi-daily-report-12-may-2021/#barry-tompkins