Vanessa Alarcon saw them while working at an antiwar rally in Lafayette Square last month. I heard someone say, 'Oh my god, look at those,' " the college senior from New York recalled. "I look up and I'm like, 'What the hell is that?' They looked kind of like dragonflies or little helicopters. But I mean, those are not insects." Out in the crowd, Bernard Crane saw them, too. "I'd never seen anything like it in my life," the Washington lawyer said. "They were large for dragonflies. I thought, 'Is that mechanical, or is that alive?' " Some suspect the insectlike drones are high-tech surveillance tools, perhaps deployed by the Department of Homeland Security. No agency admits to having deployed insect-size spy drones. But a number of U.S. government and private entities acknowledge they are trying. So what was seen by Crane, Alarcon and a handful of others at the D.C. march -- and as far back as 2004, during the Republican National Convention in New York, when one observant ... peace-march participant described on the Web "a jet-black dragonfly hovering about 10 feet off the ground, precisely in the middle of 7th Avenue . . . watching us?" Three people at the D.C. event independently described a row of spheres, the size of small berries, attached along the tails of the big dragonflies -- an accoutrement that [Jerry Louton, an entomologist at the National Museum of Natural History,] could not explain. And all reported seeing at least three maneuvering in unison. "Dragonflies never fly in a pack," he said. Mara Verheyden-Hilliard of the Partnership for Civil Justice said her group is investigating witness reports and has filed Freedom of Information Act requests with several federal agencies. If such devices are being used to spy on political activists, she said, "it would be a significant violation of people's civil rights."