Rome, June 28 - Sabotage on Friday paralyzed the website of the company belonging to a computer guru who, together with comedian Beppe Grillo, founded the anti-establishment Five-Star Movement (M5S) in Italy. The website for the company Casaleggio e Associati, which advises on networking strategies, became unnavigable for hours on Friday. As of 3pm, its Internet address called up a blank, white page. The company's founder Gianroberto Casaleggio, is an Internet entrepreneur who co-founded M5S and edits Grillo's blog - the primary political political platform for the movement that won a quarter of the popular vote in Italy's parliamentary election in February. The website sabotage follows a series of cyber-attacks on Casaleggio, Grillo said in posts on the social network Twitter Friday morning. A post on the Facebook profile of MP Adriano Zaccagnini, formerly M5S, said the attack was carried out by Anonymous group of hackers. Zaccagnini, who resigned from M5S over its internal politics this week, is one of a series of M5S parliamentarians to either leave or be kicked out of the group.