" Nixon was not apparently involved in the illegal interventions removing elected governments of other states."

Not unless you ignore the assassination of Salvadore Allende.

"The possibility of Allende winning Chile's 1970 election was deemed a disaster by a US government who wanted to protect US business interests and prevent any spread of communism during the Cold War.[37] In September 1970, President Nixon informed the CIA that an Allende government in Chile would not be acceptable and authorized $10 million to stop Allende from coming to power or unseat him.[38] The CIA's plans to impede Allende's investiture as President of Chile were known as "Track I" and "Track II"; Track I sought to prevent Allende from assuming power via so-called "parliamentary trickery", while under the Track II initiative, the CIA tried to convince key Chilean military officers to carry out a coup.[38]
During Nixon's presidency, U.S. officials attempted to prevent Allende's election by financing political parties aligned with opposition candidate Jorge Alessandri and supporting strikes in the mining and transportation sectors.[39]"