According to this travel warning from the State Department, urging Americans to reconsider non-essential travel to the Philippines, there's a pretty strong link between the Communists and the terrorists:

The terrorist New People's Army (NPA), the military arm of the Communist Party of the Philippines, operates throughout the Philippines and has issued public threats against U.S. citizens and interests in the Philippines. In January 2002, an American tourist was shot and killed by an unidentified gunman on the slopes of Mt. Pinatubo in Pampanga Province, an area known for NPA activity.

Americans are warned to avoid hiking or camping in this area and are advised to exercise caution when traveling elsewhere in the Philippines due to armed clashes between the New People's Army and government troops in some areas.

Americans are also advised to exercise special caution when traveling throughout the Philippines around the time of the national elections on May 10, as election-related violence has been widely reported in this and during previous elections, especially in areas where the NPA remains active.

It's worth noting that, among other things, Al Qaeda soldier Ramzi Yousef sought sanctuary in the Philippines so he could plan the Project Bojinka terror plot. (The plot failed; it was uncovered when Yousef accidently set his apartment on fire and a local police dispatcher stumbled onto the operation.)