What is The Six Acts?

Legal Definition
The acts passed in 1819, for the pacification of England, are so called. They, in effect, prohibited the training of persons to arms; authorised general searches and seizure of arms; prohibited meetings of more than fifty persens for the discussion of public grievances; repressed with heavy penalties and cenfiscations seditious and blasphemous libsls; and checked pamphleteering by extending the newspaper stamp duty to political pamphlets. Brown.
-- Black's Law Dictionary