Secret Public Record Office files from 1977 show senior Stormont officials believed Ian Paisley was associated with loyalist paramilitaries.
The remarks made by the officials reveal they considered arresting the now first minister for conspiracy.
Almost 400 confidential state papers from 30 years ago were released but 50 files remain closed.
Among them are documents relating to the economic activities of paramilitary organisations.
The remarks on Mr Paisley were recorded in the minutes of a conversation among senior Stormont officials during the United Ulster Action Council Strike.
It was suggested that the DUP leader should be arrested for conspiracy.
The documents also show that the military was ready to seize power stations if workers threatened a stoppage.
State papers released in the Irish Republic reveal that Lord Mountbatten, murdered by the IRA in 1979, was in favour of Irish unity.
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