milw0rm is a group of "hacktivists

Hacktivism

Hacktivism is the use of computers and computer networks as a means of protest to promote political ends. The term was first coined in 1994 by a member of the Cult of the Dead Cow hacker collective named Omega...

" best known for penetrating the computers of the Bhabha Atomic Research Centre

Bhabha Atomic Research Centre

The Bhabha Atomic Research Centre is India's primary nuclear research facility based in Mumbai. It has a number of nuclear reactors, all of which are used for India's nuclear power and research programme.- History :...

 (BARC) in Mumbai

Mumbai

Mumbai , formerly known as Bombay in English, is the capital of the Indian state of Maharashtra. It is the most populous city in India, and the fourth most populous city in the world, with a total metropolitan area population of approximately 20.5 million...

, the primary nuclear research facility of India

India

India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

, on June 3, 1998. The group conducted hacks for political reasons, including the largest mass hack up to that time, inserting an anti-nuclear weapons agenda and peace message on its hacked websites. The group's logo featured the slogan "Putting the power back in the hands of the people."

The BARC attack generated heated debate on the security of information in a world prevalent with countries developing nuclear weapons and the information necessary to do so, the ethics of "hacker activists" or "hacktivists," and the importance of advanced security measures in a modern world filled with people willing and able to break into insecure international websites.
Little is known about the members of milw0rm, which is typical of hacking groups, which often conceal members' identities to avoid prosecution.