H. R. Haldeman, John Ehrlichman, John N. Mitchell, Charles Colson, Gordon C. Strachan, Robert Mardian, and Kenneth Parkins
Step-by-step explanation
On March 1, 1974, a grand jury in Washington, D.C., indicted several former aides of Nixon, who became known as the "Watergate Seven"—H. R. Haldeman, John Ehrlichman, John N. Mitchell, Charles Colson, Gordon C. Strachan, Robert Mardian, and Kenneth Parkinson—for conspiring to hinder the Watergate investigation.