The spam involved a US government lottery to give "green cards" to certain non-citizens, allowing them to stay and work in the country. The two lawyers offered to do the necessary paperwork for a fee, although it could be done for free through government offices.
They sent the notice to at least 6,000 discussion groups in Usenet, a huge number at the time, leading to a great outcry and the first large-scale use of software "cancel-bots" to troll Usenet and kill their messages.
Canter and Siegel established a group called Cybersell, with the Web domain www.sell.com, and sold themselves as experts in the then-new business of online retail, writing a book titled "How To Make a Fortune on the Information Superhighway."
The couple eventually had a falling out, with Canter getting disbarred and Siegel taking over the business. She has released new versions of the book under her name only.