The First Wizarding War

Quote	Source
"In the old days he had huge numbers at his command; witches and wizards he'd bullied or bewitched into following him, his faithful Death Eaters, a great variety of Dark creatures."	Book 5, Page 93 Order of the Phoenix, Chapter 5, "The Order of the Phoenix"
"Molly, that's enough," said Lupin. "This isn't like last time. The Order is better prepared, we've got a head start, we know what Voldemort's up to -"	Book 5, Page 177 Order of the Phoenix, Chapter 9, "The Woes of Mrs. Weasley"
From an inner pocket of his robes Moody pulled a very tattered old Wizarding photograph. ... "That's Marlene McKinnon, she was killed two weeks after this was taken, they got her whole family. That's Frank and Alice Longbottom -" ... "Poor devils," growled Moody. "better dead than what happened to them ... and that's Emmeline Vance, you've met her, and that there's Lupin, obviously ... Benjy Fenwick, he copped it too, we only ever found bits of him" ... "That's Edgar Bones ... brother of Amelia Bones, they got him and his family too, he was a great wizard ... Sturgis Podmore, blimey, he looks young ... Caradoc Dearbon, vanished six months after this, we never found his body ... Hagrid, of course, looks exactly the same as ever ... Elphias Doge, you've met him, I'd forgotten he used to wear that stupid hat ... Gideon Prewett, it took five Death Eaters to kill him and his brother Fabian, they fought like heroes..." "That's Dumbledore's brother Aberforth, only time I ever met him, strange bloke ... That's Dorcas Meadowes, Voledmort killed her personally ..."	Book 5, Pages 173-174 Order of the Phoenix, Chapter 9, "The Woes of Mrs. Weasley"
"Sirius, I need you to set off at once. You are to alert Remus Lupin, Arabella Figg, Mundungus Fletcher - the old crowd."	Book 4, Page 713 Goblet of Fire, Chapter 36, "The Parting of the Ways"
..."You-Know-Who and his followers sent the Dark Mark into the air whenever they killed," said Mr. Weasley. "The terror it inspired ... you have no idea, you're too young. Just picture coming home and finding the Dark Mark hovering over your house, and knowing what you're about to find inside. ..." Mr. Weasley winced. "Everyone's worst fear ... the very worst ..." ... "Harry, that's their idea of fun. Half of the Muggle killings back when You-Know-Who was in power were done for fun."	Book 4, Pages 142-143 Goblet of Fire, Chapter 9, "The Dark Mark"
"Years back, there were a lot of witches and wizards being controlled by the Imperius Curse," said Moody, and Harry knew he was talking about the days in which Voldemort had been all-powerful.	Book 4, Page 213 Goblet of Fire, Chapter 14, "The Unforgiveable Curses"
"Imagine that Voldemort's powerful now. You don't know who his supporters are, you don't know who's working for him and who isn't; you know he can control people so that they do terrible things without being able to stop themselves. You're scared for yourself, and your family and your friends. Every week news comes of more deaths, more disappearances, more torturing ... the Ministry of Magic's in disarray, they don't know what to do, they're trying to keep everything hidden from the Muggles, but meanwhile, Muggles are dying too. Terror everywhere ... panic ... confusion ... that's how it used to be. ... The Aurors were given new powers - powers to kill rather than capture, for instance. ... handed straight to the Dementors without trial. Crouch fought violence with violence, and authorized the use of the Unforgivable Curses against suspects."	Book 4, Pages 526-527 Goblet of Fire, Chapter 27, "Padfoot Returns"
Fudge grimaced. "He used giants last time, when he wanted to go for the grand effect," he said.	Book 6, Page 13 Half-Bood Prince, Chapter 11, "The Other Minister"