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Pigeons get plucked. The sentence roughly translates into "Neither fools nor spies.".

In this context it means "a naive person or a dupe willing to accept everything".

A pigeon is a naive person being conned. It probably refers to the "pigeons" movement of French entrepreneurs opposed to taxes on sales of companies.

"pigeon" is widely used, and the movement of entrepreneurs used this word specifically because of its already-existing meaning.

It means "sucker" or "dupe".

Sucker ? One who is being conned.

Sucker's better: Neither suckers nor spies.