George Orwell's Thought Police change records and memories so that it is as if the past has been changed.
The temporal bureau in Robert Heinlein's "-All You Zombies-" causes the past events that it has caused but only those.
The Service in James Blish's "Beep"/The Quincunx Of Time is an Event Police ensuring future events.
(Blog readers might recognize this as a quick breakfast post before going out for the day.)
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