Regicide synonyms

I am not speaking of regicide, I am speaking about ideas.

Fourteen years ago, they committed regicide on Margaret Thatcher when they thought she would lose them an election.

Charles used his influence to carry through parliament the act of indemnity, and the execution of some of the regicides was a measure not more severe than was to be expected in the times and circumstances; but that of Sir Henry Vane, who was not a regicide and whose life Charles had promised the parliament to spare in case of his condemnation, was brought about by Charles's personal insistence in revenge for the victim's high bearing during his trial, and was an act of gross cruelty and perfidy.

Following the regicide in 1649, sole authority now rested with Cromwell, ' Lord Protector '.