What is "nullcrew"

NullCrew is a hacktivist group founded in 2012 that takes responsibility for multiple high profile computer attacks against corporations, educational institutions, and government agencies. Its members are listed as: Zer0Pwn, rootcrysis, nop, and Siph0n. NullCrew is often compared to LulzSecurity, even though the group has lasted twice as long; and is still going strong.