Answer
The Event that signaled the shift and directional change of SNCC was Stokely Carmichael became its leader in 1966.
Step-by-step explanation
Stokely Carmichael became the chair of SNCC and Black Power in 1966 taking over another activist who was joining the congress. During his position in the group, he helped the organization of Lowndes County Freedom Organization , a political party at the county connected to Black Panther.