(ANSA) - Venice, October 4 - Four workers from a chemical company climbed the bell tower in Venice's Piazza San Marco on Thursday to protest conditions with their employer. One employee, Nicoletta Zago, told ANSA by telephone that she hadn't been paid by the chemicals firm Vinyls, located in nearby Porto Marghera, for five months. "We are tired of being taken for a ride," she said. Another worker named Lucio said the protest was intended to be peaceful. Workers from the company, part of the giant ENI fuels group, have protested throughout Italy and made insistent appeals to the government to force ENI to find a buyer for the firm, especially its Sardinian plant which closed in 2010.