51% Attacks

Miners
CoinSummit Day Two: Mining Superpowers and the 51% Challenge
During the second day of CoinSummit in London, miners talked nomenclature while exchange operators discussed banking.
Miners

ghash.io
Ghash.io: We Will Never Launch a 51% Attack Against Bitcoin
CEX.IO has issued a statement addressing the mining pool's growing size and influence over bitcoin's core infrastructure.
ghash.io

bitfury
BitFury Pulls 1PH/s of Mining Power from Ghash.io Amid Community Uproar
Due to fears that Ghash.io would reach 51% of the bitcoin network, BitFury is withdrawing resources from the pool.
bitfury

litecoin
Litecoin Miners Urged to Leave Coinotron Pool Over 51% Threat
Litecoin miners are being urged to leave the Coinotron pool, due to an increase in its hash rate.
litecoin

mining
Bitcoin Miners Ditch Ghash.io Pool Over Fears of 51% Attack
Bitcoin miners around the world are leaving Ghash.io, following a significant increase in the pool’s hash share.
mining