The one attack carried out by the FEA demonstrates an impressive level of planning, organization, and funding.  The group placed and detonated eleven explosive devices, consisting of 50 total gas canisters.  FEA's environmental ideology makes it unlikely that they are strongly tied to other Greek terrorist groups, which are generally not seriously concerned with the environment.  The group is not known to have been involved in any other attacks and is presumed to have disbanded.

May 98 -- Rival
Revolutionary Organization 17 November (RO-N17) -- Ally (Suspected)
Revolutionary People's Struggle -- Ally (Suspected)

Nothing is known about the Fighting Guerrillas of May aside from the information that can be gleaned from the few attacks for which the group has claimed responsibility.  On May 18, 1998, two bombs went off almost simultaneously in Athens: one at the offices of Olympic Airways, and one at the Ionian Bank.  Both Ionian Bank and Olympic Airways were being restructured by the Greek government as part of a controversial budget-reduction plan targeting state-run utilities and services.  The Greek police believe that both bombs were constructed by the same group.  Both the May 98 and Fighting Guerillas of May, however, have laid claim to the bombings, and it is not known for sure whether Fighting Guerillas of May is responsible for both bombs, neither bomb, or one bomb.  Whether or not the group actually committed the attacks in question, the fact that Fighting Guerillas of May wants credit for the bombings indicates that they agree with the principles behind them.  Those principles seem to be the same anti-capitalist ideals shared by most Greek terrorists.

The sophistication of the bombs used in Fighting Guerillas of May's attacks has led police to speculate that they are a front for either November 17 or ELA.  Whether or not that is the case, the group is clearly more capable and better funded than many other terrorist groups in Greece.  The Fighting Guerillas of May have not claimed responsiblity for an attack since 1998.