In 1979, the party held its ninth congress, which analysed the state of post-revolutionary Portugal, right-wing politics, and the party's struggles to nationalize the economy. In December 1979, new elections took place. The party formed the United People Alliance (Portuguese: "Aliança Povo Unido" or APU) in coalition with the Portuguese Democratic Movement (Portuguese: "Movimento Democrático Português" or MDP/CDE) and increased its vote to 18.96% and 47 seats. The election was won by a centrist/right-wing coalition led by Francisco Sá Carneiro, which immediately initiated policies that the party considered to be contrary to working-class interests. Despite a setback in a subsequent election in 1980, in which the PCP dropped to 41 seats, the party achieved several victories in local elections, winning the leadership of dozens of municipalities in the FEPU coalition. After the sudden death of Sá Carneiro in an air crash in 1980, the party achieved 44 seats and 18.20% of the vote as part of the APU in the 1983 elections. Also in 1983, the party held its tenth congress, which again criticized what it saw as the dangers of right-wing politics.