The Independent Police Complaints Commission says it is "considering" a claim from Arthur Scargill that South Yorkshire Police kept a "conspiracy file" on him.
The former President of the National Union of Mineworkers says his arrest during the infamous 'Battle of Orgreave' in 1984 was pre-planned.
Mr Scargill claims the decision to arrest him was made "at the very highest level".
Arthur Scargill, one of Margaret Thatcher's greatest domestic foes, has publicly remained silent since her death - but a text message seen by ITV News has revealed his reaction to the news.
Scargill, who led the National Union of Mineworkers during the 1984/85 miners strike, exclaimed "SCARGILL ALIVE!" when he received a text that read, "Thatcher's dead".
The man who sent the "Thatcher Dead" text message to Arthur Scargill described the moment he got the reply. Ken Capstick, the Treasurer of the Socialist Labour Party said Scargill was feeling "fine".
One of Margaret Thatcher's biggest domestic conflicts came with powerful union boss Arthur Scargill. He clashed bitterly with her during the 1984/85 miners' strike.
Scargill has managed to avoid media attention since Thatcher's death - but now, for the first time, ITV News can reveal his response.
Arthur Scargill was sent a text message by Ken Capstick, the Treasurer of the Socialist Labour Party which read: "Thatcher Dead". As pictured below, back came this equally short reply from Scargill: "SCARGILL ALIVE !"
Anne Scargill, the former wife of Arthur Scargill who led the miners during strike action, told Daybreak she was "happy" to hear about Margaret Thatcher's death, calling her an "evil" woman.
She said: "[Thatcher] was intent on smashing the trade unions, and in it she smashed the country.
"She called us the enemy within, there were only one enemy within and that were her."
Former miners' leader Arthur Scargill has lost his High Court battle to have the National Union of Mineworkers continue to meet the costs of his London flat for his lifetime.