Not to forget fratricidal intra-left assasinations like Joaquin Villalobos of the FMLN killing communist poet Roque Dalton as a supposed CIA agent in '75.
http://www.art.man.ac.uk/SML/EPOCC/Events/beasley.htm
http://www.pacificnews.org/jinn/stories/5.22/991111-salvadoran.html
http://www.nybooks.com/articles/article-preview?article_id=6620 by the late Murray Kempton. The Dissent piece by G. Zaid is on the Dalton hit. Some credulous CISPES members in Santa Cruz in the mid-80's were reduced to sputtering standard issue Stalinoid invective when queried about Dalton's killing.
"By Murray Kempton
Enemy Colleagues: A Reading of the Salvadoran Tragedy by Gabriel Zaid Dissent Magazine, (521 Fifth Avenue, NY, NY 10017), $3.00
The public enlightenment about El Salvador would be signally served by the current issue of Dissent if the enlightenment afforded by an organ with a circulation of less than 6,500 could realistically be called public...)
Or (putting left in quotes, though I betcha I could find statements from "anti-imperialists" hailing it at the time) the Abu Nidal org. killing Palestinian negotiator Issam Sartawi at a Congress of the SI in '83.
Fatah - Revolutionary Council (Abu Nidal Organization) ... 1983: Assassination of PLO official Issam Sartawi at the Socialist International ... the Western Sector forces of Fatah, assassinated by an Abu Nidal ... Description: History, ideology and strategy, leadership, terrorist activity, articles, updates and history of attacks.... Category: Society > Issues > ... > ANO - Abu Nidal Organization http://www.ict.org.il/inter_ter/orgdet.cfm?orgid=2
Or Carlo Tresca, legendary Italian-American anarchist killed by Stalinist in the 40's. (See the Gallagher book on this., "All The Right Enemies.")
Anarchists, Trots killed by PCE and GPU/NKVD in the Spanish Civil War.
Trots killed by the score in Vietnam by the VCP.
http://www.marxists.org/history/etol/revhist/backiss/Vol3/No2/Pirani.html
"Legal Leftists" and Lesbians killed by the Sandero Luminoso.
Hungary, '56...
I could go on and on and on... Michael Pugliese, oer the limit, gotta see how the voter turnout is going anyway...Turnout was high when I voted @9 A.M. GO Peter Camejo!