Longreads is brought to you in association with Haymarket Books.

One Haymarket book you might enjoy is Breaking the Impass,

Electoral Politics, Mass Action, and the new Socialist movement in the United States

by Kim Moody. Moody looks at the factors that have shaped the rise of a new left-wing movement

in the US and discusses the election campaigns of Socialist politicians like Bernie Sanders.

You can find Breaking the Impass at haymarketbooks.org.

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Hello, you're very welcome to Longreads, a Jackamon podcast where we look in

depth at political topics and thinkers. My name is Daniel Finn,

and the features editor here at Jackamon and I'll be presenting the show.

For almost 50 years, Portugal was ruled by a right-wing dictatorship.

There was a military coup against Portuguese democracy in 1926. Antonio Salazar became the leader

of the so-called Estado Novo in the same year Franklin Roosevelt entered the White House.

His successor, Marcello Caetano, was still in power when Richard Nixon was reelected for decades later.

The tides of European history had left the Estado Novo fully intact.

Then a song began playing on the radio.

This melancholy ballad about lost love was Portugal's entry for the Eurovision song contest in 1974.

It came joint last, with just three points. Sweden's Abba took the crown that year,

but their breakthrough hit Waterloo. But the song by Paulo de Carvalho found a different way

to secure immortality. On the evening of April 24th, just a few weeks after Eurovision,

it was the musical cue for a revolution. A group of junior army officers made a plan to

overthrow the dictatorship. They chose the song as a coded signal to be played over the radio

...