It’s the start of a storm in Spain – about so-called ‘political tourism’.

Members of Spain’s leftist party, Podemos, the Basque terrorist group, ETA, and a Catalan anti-capitalist party, CUP, headed for Venezuela in a private plane laid on by President Nicolás Maduro – leader of a nationalist government which many now regard as a regime.

Now Spain’s politicians are demanding explanations.

Exclusive images from Spanish TV channel Antena 3 last night showed figures from all three groups on the tarmac at Madrid’s airport in December 2014 headed for Caracas on a presidential plane laid on especially by Venezuelan leader Nicolás Maduro.

What were these groups doing being flown privately by this divisive political figure – and how close are they to him?

Among those on board was Anna Gabriel, the spokesperson and politician for the CUP, a Catalan anti-capitalist, anti-EU and anti-NATO party which is propping up a pro-independence Catalan government.

All she had to say to reporters was that she was up to “very interesting things” in Venezuela.

Very interesting things included discussing neo-Fascism, the destructive effects of capitalism, the right to decide about the break-up of Spain, and ETA.

Another aboard was Iñaki Gil de San Vicente, the father-in-law of the number one man in ETA, the Basque terrorist group responsible for killing 829 people in its struggle for separatism. He’s also the father of a Basque terrorist arrested in France.

And from Spain’s third biggest political force, Podemos, was María José Aguilar, member of the party in Spain’s central Castilla la Mancha region. The party wished to distance Aguilar’s journey from the party, saying that she went to attend the conference for its intellectual, artistic discussions instead.

15 Spanish nationals were aboard the plane in total, with over 30 people from 13 nationalities flying altogether.

The Spanish Interior Minister questioned the circumstances surrounding the private plane – and the consequences the scandal could have on Spanish politics. Jorge Fernández Díaz called it “unprecedented” and said it wasn’t the “normal thing” for a leader of a country to lay on a plane.

The images have caused uproar on social media, with some users condemning Antena 3 for the poor taste of its journalism. The scoop was also splashed over nearly all of the front pages of Spain’s daily newspapers.

Spain’s newest political party Podemos – which had one of its members on board – has previously allied itself with chavismo – a left-wing ideology which takes its name from the late Venezuelan leader Hugo Chávez. It was an answer to capitalism, all about dealing with rising inequality in Latin America by promoting nationalisation, social welfare and patriotism.

Podemos even received funding from the Venezuelan government and senior figures have worked for the leadership, all while praising its democracy as one of the world’s best.

Venezuela is in the midst of a deep economic crisis. The drop in oil prices means debt repayment is becoming near on impossible and the country has finally declared an economic emergency.

Inflation has been rocketing for several years already, making the bolívar currency virtually worthless, while the economy has been shrinking since the beginning of 2014. It’s these alarming figures the Venezuelan government is seeking to hide from its own people.

Food shortages are all too common. Imports for staples such as eggs, flour and milk have become too expensive for the government, leaving supermarket shelves empty.

According to the latest Press Freedom Index from 2015, its media ranked 137 out of 180 countries, compared to Spain (33rd). Journalists have been harassed and the press has been polarised and limited.

It says: “Many local and foreign journalists were the targets of threats, insults, physical attacks, theft, destruction of equipment and arrests during a succession of protests.”

With national elections in Spain in December still far from producing a new government, any tremors of instability there are  enough to whip up a political storm.