"in one bloc" is correct and usable in written English.
It is often used to refer to a group of things or ideas that are all considered together. For example, "The student took all the exams in one bloc, and earned an A in each one."
Exact(3)
"One of the first things we did in Austin was to have several meetings so the students, the older generation, the lefties, the monarchists, pretty much everyone could come together in one bloc and agree to support a new election, the freeing of political prisoners, and the arrest of people opening fire on the protesters," said Madaninejad.
First, totalitarian regimes concentrate political power in one bloc and offer the ruled no alternative.
In Moscow, the belief was that any trends towards democracy in one bloc country could lead to the destruction of communism and the ruin of Soviet influence in the region as a whole.
Similar(55)
In fact, only one bloc, the four-plus-usually-one conservative bloc, is rigid.
People do not always form one bloc on all subjects.
Blacks do not comprise one bloc of people.
On Thursday, Iyad al-Samarraie, Tawafiq's head and a senior leader in one of the bloc's main parties, the Iraqi Islamic Party, said in an interview that he had been nominated for the position.
In one go, the bloc will lose around a sixth of its total economic output.
The European Union allows companies that hold a license in one country to "passport" it to other members of the bloc.
While a large chunk of the Republican electorate opposes abortion in one form or another, there has never been a substantial bloc in opposition to contraceptive services.
In one attack, an Israeli driver was shot dead tonight on the tunnel road between Jerusalem and the Gush Etzion settlement bloc in the West Bank.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com