મૂર્ખાઓના ગામમાં ધુતારા વસે, ધપ્પા પડે ને ખડખડ હસે.

mūrkhāōnā gāmamāṁ dhutārā vasē, dhappā paḍē nē khaḍakhaḍa hasē.

Literally: In the village of fools, swindlers reside; blows are dealt, and they laugh out loud.
What it means: Con artists easily thrive and exploit people in a community of gullible fools.

Also said as

ગુજરાતી કહેવતસંગ્રહ (Gujarati Kahevat Sangrah) (1923) · read from the scan by machine — the Gujarati itself is unchecked · English is machine-made and nobody has checked it yet

Heard it differently, or know we've got the sense wrong? Tell us — that is exactly the kind of correction this needs.