There are jurisdictions where high ranking officials (like the head of state or the head of government) can be removed from office by the Supreme Court but they all require charges to be brought by the legislature.
While removal rerquires some form of misconduct, it usually doesn't require a criminal conviction. This has two reasons:
- High-ranking officials may enjoy immunity from criminal prosecution, making removal from office a prerequisite for a criminal trial.
- Official misconduct can be illegal or unconstitutional without it being a crime. Say parliament enacts a law and the prime minister decides to not enforce it. That's not a crime but it is unconstitutional and may warrant removal.
Here's an overview of a few countries where a court decides on removal from office (taken from this Wikipedia article):
Country |
Who can be removed |
Why can they be removed |
Who can initiate proceedings |
Deciding court |
Czechia |
President |
High treason or gross violations of the constitution |
Parliament with 3/5 majority in both chambers |
Constitutional Court |
Denmark |
Any minister |
Unlawful misconduct and maladministration of office |
Parliament with absolute majority or the Monarch |
Court of Impeachment (comprised of 15 Supreme Court judges and 15 members of parliament |
Germany |
President |
Willful violation of the constitution or another law |
Parliament with 2/3 majority in either chamber |
Constitutional Court |
Italy |
President |
High treason or violation of the constitution |
Parliament with absolute majority in both chambers1 |
Constitutional Court with an additional 16 parliamentary appointees |
South Korea |
President, ministers, judges, ... |
Violation of constitutional or statutory duties |
Parliament with absolute majority |
Constitutional Court |
Turkey |
President, ministers |
Crimes |
Parliament with 2/3 majority |
Constitutional Court |
In each of these cases, the deciding court holds a trial and ultimately decides if the official should be removed from office.
So no, it's not unusual for a Supreme Court to remove a member of the executive from power without a prior criminal conviction.
What is unusual is that the proceedings in Israel were initiated by a rather small number of people from an advocacy group. In the countries I examined, the proceedings can only be initiated by a parliamentary (super-)majority.
1: This happens in a joint session, so no separate majorities are necessary, just an absolute majority of all parliamentarians regardless their chamber.