avant-garde artists (and others, particularly in academia) left Argentina, many never to return. The return of exiled President Juan Perón in 1973 resulted in conflict with the PFA, when the calculating populist had Alberto Villar named as chief at the behest of adviser José López Rega. Villar was a member of López Rega's newly organized paramilitary group, the Argentine Anticommunist Alliance, and Villar's participation in spiraling violence between the group and those on the far left led to his assassination in 1974. The institution's prestige was further damaged following the March 1976 coup, when the force participated in the abduction, torture and murder of thousands of dissidents and others. It was only with the 1983 presidential elections (and the return to democratic rule) that the FP began restoring its prestige and its relations with the Argentine people, especially with the 1986 appointment of Juan Angel Pirker as police commissioner general. The 1993 Olivos Pact between President Carlos Menem and his predecessor, UCR leader Raúl Alfonsín resulted in the 1994 reform of the Argentine Constitution, whose article 129 granted the City of Buenos Aires greater self-governance. This in principle included the transfer of control of the 25,000-strong Federal Police to the Jefe de Gobierno (elected Mayor), and the Buenos Aires City Legislature. Shortly before the historic, June 30, 1996, elections to these posts, however, a senior Peronist Senator, Antonio Cafiero, succeeded in limiting the city's autonomy by advancing National Law 24.588, which reserved control of the force, among other faculties, to the national government. The controversial bill, signed in 1996 by President Menem, remained a sticking point between successive Presidents (most of whom have been Peronist) and Buenos Aires Mayors (none of whom have been). A 2005 agreement on principles between Mayor Aníbal Ibarra and President Néstor Kirchner was followed by the modification of the especially contentious article 7, which denied the city its own, local police force, in 2007 - though the "Cafiero Law" otherwise remains in force. Efforts since 2007 by Mayor Mauricio Macri to declare it unconstitutional have thus far failed, and though the Mayor inaugurated a Metropolitan Police, issues of revenue sharing for its financing remain pending. The PFA, since 1974, maintains a university specializing in criminology, is associated with Interpol, and participates in special forces training programs at the Los Angeles Police Department. In January 2017, most of the Federal Police agents serving in the city