Praying in the synagogue aisles

In the synagogue there are narrow aisles between the rows of benches. There are people who stand there during the Shemoneh Esrei prayer and block the passage so that it is impossible to pass. Is this considered theft from the public (gezel harabim)? And does this create any problem regarding the validity of their prayer?

שלום וברכה 

This is not considered “gezel” (theft), but it is not proper conduct. 

There is no problem with the prayer itself, since the issue is not with the prayer, but with the place where the person is standing. 

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