Final answer:
The protest tactic initiated by black students in Greensboro, North Carolina, in 1960 was the sit-in. It formed an integral part of the Civil Rights Movement and led to the creation of the SNCC.
Step-by-step explanation:
The protest tactic initiated by black students in Greensboro, North Carolina, was known as the sit-in. On February 1, 1960, four students from the North Carolina Agricultural & Technical College - Ezell Blair, Jr., Joseph McNeil, David Richmond, and Franklin McCain - sat down at the segregated lunch counter of the local Woolworth's store and were denied service. This act of nonviolent protest quickly garnered attention and spurred a wave of similar sit-in protests, engaging over 71,000 participants across the nation. The success of these sit-ins was instrumental in the formation of the Student Nonviolent Coordinating Committee (SNCC), significantly advancing the Civil Rights Movement.