Tom Watson has bought shares in News Corp - and has said he plans to address its annual conference on 21st October.
The Labour MP is known his criticism in Parliament of the News of the World's involvement in phone-hacking and was one of the key figures in exposing the practice.
On Wednesday morning he announced during a meeting of the culture, media and sport select committee that he now held shared in the company.
He later told Bloomberg news:"For an organisation that believes in freedom of speech, it would be pretty extraordinary if they tried to stop me from being heard", adding: that he wanted to "make sure the shareholders are fully informed about the things their company is doing in the UK".
He later tweeted: "Bags packed. Dollars in wallet. Passport safe. Hollywood here I come."
At the 2011 Labour Party conference, Watson described News International as being "sick from top to bottom" and has earlier this year publicly called for the suspension of James Murdoch from his post as Chairman of News International.