グレナダ侵攻
On his return to the United States, Marksman founded and published the magazine "Caribbean Perspective". He was also a frequent contributor to "Covert Action Quarterly" and to the "New York Amsterdam News". From 1979 to 1983, Marksman was a publicist for the New Jewel Movement Marxist-Leninist People's Revolutionary Government of Grenada, in which capacity he was a co-producer of the documentary film "Grenada: The Future Coming Toward Us"; his service ended with the US Invasion of Grenada. Marksman taught journalism part-time at Long Island University.