Fiat's plants and hoisted the red flag of communism over them. Agnelli responded by quitting the company. However, the Italian Socialist Party and its ally organization, the Italian General Confederation of Labour, in an effort to effect a compromise with the centrist parties ordered the occupation ended. In 1922, Fiat began to build the famous Lingotto car factory—then the largest in Europe—which opened in 1923. It was the first Fiat factory to use assembly lines; by 1925, Fiat controlled 87% of the Italian car market. In 1928, with the 509, Fiat included insurance in the purchase price. Fiat made military machinery and vehicles during World War II for the Army and Regia Aeronautica and later for the Germans. Fiat made obsolete fighter aircraft like the biplane CR.42 Falco, which was one of the most common Italian aircraft, along with Savoia-Marchettis, as well as light tanks (obsolete compared to their German and Soviet counterparts) and armoured vehicles. The best Fiat aircraft was the G.55 fighter, which arrived too late and in too limited numbers. In 1945—the year Mussolini was overthrown—the National Liberation Committee removed the Agnelli family from leadership roles in Fiat because of its ties to Mussolini's government. These were not returned until 1963, when Giovanni's grandson, Gianni, took over as general manager until 1966, as chairman until 1996. Gianni Agnelli Among the younger Agnelli's first steps after gaining control of Fiat was a massive reorganization of the company management, which had previously been highly centralized, with little provision for the delegation of authority and decision-making. Such a system was effective in the past, but lacked the responsiveness and flexibility needed by Fiat's steady expansion, and the growth of its international operations in the 1960s. The company was reorganized on a product-line basis, with two main product groups—one for passenger cars, the other for trucks and tractors—and a number of semi-independent division and subsidiaries. Top management, freed from responsibility for day-by-day operations of the company, was able to devote its efforts to more far-reaching goals. In 1967, Fiat made its first acquisition when it purchased Autobianchi; with sales amounting to $1.7 billion, it outstripped Volkswagen, its main European competitor, and in 1968 produced some 1,750,000 vehicles while its sales volume climbed to $2.1 billion. According to Newsweek in 1968, Fiat was "the most dynamic automaker in Europe...[and] may come closest to challenging the worldwide supremacy of Detroit." Then, in 1969,