Since you mention it, I can write a few things
![Big Grin :D :D](/data/assets/smilies/biggrin.gif)
Cabinda is a good example of the games played with liberation movements in Africa, where people became cannon fodder for ambitious bastards who suddenly saw the possibly of setting themselves up as little tyrant "liberators", quite often while at the service of some other power.
The first "liberation movement" to claim Cabinda was UPNA, which formed in 1954 in Leopoldville and claimed the north of Angola and Cabinda. They originally aimed to recreate the old Kingdom of Kongo and turned into UPA in 1958 (which later changed name again to FNLA).
A bit later, in 1956 another group popped up, AIEC based in Brazzaville, which claimed the annexation of Cabinda to Congo (Brazzaville). They remained inactive as the rather corrupt and pro-western regime of Fulbert Youlou in Congo Brazzaville kept good relations with the portuguese government. He only had designs on the territory should (when...) Portugal abandon its colony. This was the first of several instruments set up by Youlou in order to have a claim over Cabinda. This group never did anything and either disappeared or were folded into FDLA in 1963. That, btw, was a failed project led by MPLA with the intention of obtaining recognition by the new Organization of African Unity, which sent a mission to the Congoes in 1963 to observe the "liberation movements" of Angola and ended up recognising only FNLA.
The regime of Fulbert Youlou was toppled in 1963 and replaced with a socialist one which, as a consequence of the OUA decision, moved to supress FDLA (and, ironically nearly wiped out the socialist MPLA which existed solely in exile at the time) and limited support to FLEC.
FLEC was yet another "liberation movement" that started as AREC (Association of the Residents of the Cabinda Enclave), founded in Leopoldville in 1958, claiming independence for (and, needless to say, control over) Cabinda. This was the one that turned into MLEC in 1960 and still exists today, merged with two other tiny movements to form FLEC in 1963. They were also under the influence of Youlou until 1963.
Sidenote about all the name changes: they happened as these movements sought to imitate the algerian FLNA in name, as if their prestige (having defeated the french) would pass into all these new tiny groups. It was diplomatically very important as the new african countries, members of OUA, were supposed to help these movements, but only the "officially recognized" ones.
None of these movements managed to establish an actual presence in Cabinda until the early 60s. By 1963 the main "liberation movement" operating in the north of Angola was UPA/FNLA based in Zaire. Cabinda had excellent terrain for guerilla war but Portugal had sought to "buy" quiet there from the US in 1957 by handing over oil concessions to Cabinda Gulf Oil (Chevron). The consequence was that once the first significant oil finds were made in 1964 the US leaned on Mobutu to restrain the actions of both MLEC and FNLA in Cabinda. Mobutu was also kept in check by the threat posed by Moise Tshombe until his kidnapping and assassination by the Algerians in 1967: the portuguese government repeatedly supported his attempts to regain control of Katanga.
The MPLA regained support from Congo-Brazzaville in 1964, but kept being attacked by the rival FNLA whenever their guerillas met. Portugal also made use of african troops to fight off incursions in Cabinda, in particular of a group of deserters from UPA/FNLA who changed sides in 1965 (and who later would join FLEC). Both MPLA and UPA focused on Cabinda in 1964-65, but in 1966, when Gulf Oil found the first big offshore field, FNLA ceased its actions there. MPLA remained active until 1974, working from Congo Brazzaville (which had cut relations with Portugal in 1965) with cuban support.
In early 1974 FNLA became active again in Cabinda, and a large attack possibly supported by zairian and libyan troops was expected. Portugal sought air support from South Africa for the coming battle, but the portuguese revolution prevented the invasion. The war however did not end immediately: FNLA and MPLA both kept making localized attacks on portuguese positions to take ground prior to any agreement for handing over power. And also fighting each other as usual. FLEC also showed up to the party and seized some position in Cabinda, with the old deserters from UPA now joining FLEC. A mixed portuguese-MPLA force expelled it and essentially handed over Cabinda to MPLA. FNLA was wiped out in the beginning of the Angolan Civil war, leaving FLEC as the only tool for Zaire to destabilize Angola. One of limited use, because they couldn't be allowed to hamper oil production... so no, in this case no one wants FLEC around because they're
bad for business. Mobutu was probably their last important supporter. And economic control was all along profiting companies from across the Atlantic. Though some of the money eventually flowed to Portugal, granted.
Now guess why I'm such a cynical regarding any and all armed uprisings and civil wars across the world...