The global network of terrorists posing as "Islamic fundamentalists" is, in many cases, led by Marxist-Leninists directed from Moscow and Beijing through Havana, Tehran, Damascus, Tripoli, Baghdad, and the Palestine Authority. This is the "point" people need to keep in mind-- these assorted terror groups share ties & connections, some loose, some quite tight, all flowing back to a point of origin.
In theory, that was supposed to end with the breakup of the old Soviet Union.... in practice? Did it end? Cuba has always been a sponsor for revolution across the Globe, and a Soviet proxy.
Note the IRA has been rearing its head in South America again.... these groups share stuff- intelligence, safe houses, etc.
there are many that refuse to look at and or see the connection, if the connection were made they'd have to admit they were duped. products sold using the money back guaranteed if not satisfied works with little to no loss by the seller because people don't like say they've been had.