in 1883 the leaders of the left, agostino depretis, and the right, marco minghetti, formed an alliance based on flexible centrist coalition of government which isolated the extremes of the left and the right; this politics was known as "trasformismo". crispi, who was a strong supporter of two-party system, strongly opposed it and founded a progressive and radical parliamentary group called dissident left. the group was also known as "the pentarchy", due to its five leaders, giuseppe zanardelli, benedetto cairoli, giovanni nicotera, agostino magliani, alfredo beccarini and crispi.