Be industrious. There he was, industrious brother, clever salesman, winning the business for Willis Gann and they got jealous of his success.
Squealer is a character in Animal Farm by George Orwell, a pig who serves as the main minion of Napoleon and the tertiary antagonist turned anti-hero. Squealer goes around telling lies to the other gullible farm animals to cover up and or/justify Napoleon's atrocities and convince the animals to stay loyal to him.
Squealer represents the propaganda newspaper Pravda rather than a person the way the other pigs in the novel do. The statement that Squealer can turn black into white was intended to refer to Pravda's ability to turn lies into truth.