Completed the following sentence: Following the German-Italian-Bulgarian occupation of Greece during World War II, Grivas founded and led the Organization "X", a minor far-right guerrilla organization made up of officers of the Greek Army whose influence was limited to certain neighborhoods of Athens. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ Activities included spying for the Allied powers and launching minor attacks and sabotage operations against the occupiers. <unk> <unk> <unk> <unk>
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