The definition for "rein" -- when used as a verb as it was here -- from wiktionary.org is: "To stop or slow a horse by pulling the reins; To stop or slow something, by exercising control."Thus, the sentence in question indicates that the group believes the board (Maricopa County Board of Supervisors) needs to stop or slow Sheriff Arpaio by exercising control. When the word "rein" is used in this way, it is most commonly expressed as "rein in", as it was in this instance.
Citizens elect the members of the Diet.
No... citizens can vote for their local councilors or members of parliament - but the party leaders are voted in by the party members.
no
citizens
The citizens vote for the President AND Congress.
citizens
by the citizens vote
Members of the knesset.
The members of the local councils the members of the state government. the members and senators of the federal government.
directly elected by the citizens of the EU
Welfare
Picts are citizens of Scotland.