Enrique’s neighborhood, the Zetas’ enforcer shows up every morning with a check list of drivers. Anyone who hasn’t paid the daily $13 tax is threatened or killed.
No one calls police, who are widely viewed as in league with the shakedowns.

What do widely viewed, league and shakedowns mean in this context?

Question

Enrique’s neighborhood, the Zetas’ enforcer shows up every morning with a check list of drivers. Anyone who hasn’t paid the daily $13 tax is threatened or killed.
No one calls police, who are widely viewed as in league with the shakedowns.

What do widely viewed, league and shakedowns mean in this context?

Answer

Hi lompaket, 
In this context they mean the following:
Widely viewed = most people agree
in league = working together
a shakedown = when a gang/mafia threaten people for money

A more literal way to state the last sentence might be:
No one calls the police, because many people believe the Zeta's pay them to ignore the gang's crimes.

Answer

The police is widely cosidered that collaborates in frauds/swindles