What was abolished from the federal prison system in 1987 during this period is parole.
Parole was abolished fully when the federal prison system came into effect on November 1st, 1987.
The Sentencing Reform Act of 1984, passed by Congress, removed the option of parole for defendants convicted of federal crimes committed.
Before November 1987, there was the possibility of parole for a convicted person of federal crimes in the United States.
Hence, in this case, it is concluded that the correct answer is "Parole."
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