<human>:  What was the name of the first major sit-in at a lunch counter in the United States?
<bot>: The first sit-in at a lunch counter in the United States was the Greensboro sit-in. It happened in 1960 in Greensboro, North Carolina. It was organized by the Student Nonviolent Coordinating Committee (SNCC), which was founded by John Lewis, a civil rights activist. The sit-in was intended to protest racial segregation at a Woolworth's lunch counter.