Amid high-profile arrests in its Spanish cell, the American-born and designated neo-Nazi terrorist group the Base " once a major preoccupation of FBI counter-terrorism efforts " has all but faded from US headlines. But a flurry of online activities shows the group is still active stateside and considers the US an operational nerve center. Headed by Rinaldo Nazzaro, an ex-Pentagon contractor turned alleged Russian intelligence asset, the Base has been busy of late pursuing European expansion: besides its heavily armed members in Spain, its Ukrainian wing is linked to multiple acts of terrorism inside the country and claimed the high-profile July assassination of an intelligence officer in Kyiv.