The party first contested national elections in 1931, when it was part of the National Union alliance created for the general elections that year.
[2] The alliance won 289 of the 387 seats in the Chamber of Deputies, although the PUA did not take any of them.
[4] The alliance won five seats in the Chamber of Deputies, of which the PUA took two.
[3] The PUA contested the 1933 elections alone, receiving 2.5% of the vote and winning five seats in the Chamber.
[3] However, its vote share fell to 1.7% in the 1937 elections, resulting in it losing all five seats.