The rebellion had two focal points. Korach and his 250 followers objected to Aharon's priesthood, while Datan and Aviram protested Moshe's leadership.
Priest, Levites, and Prophet
The rebellion was multi-faceted, with groups complaining about both spiritual and political status. Some protested the priestly class, others rejected the choice of the Levites, while yet others had issue with Moshe or others.