How were the Britons manipulated by those who run the city?

From the text:

Where once the harass’d Briton found Repose,
And safe in Poverty defy’d his Foes;
Some secret Cell, ye Pow’rs, indulgent give.
Let —— live here, for —— has learn’d to live.
Here let those reign, whom Pensions can incite
To vote a Patriot black, a Courtier white;
Explain their Country’s dear-bought Rights away,
And plead for Pirates in the Face of Day;
With slavish Tenets taint our poison’d Youth,
And lend a Lye the confidence of Truth.

Let such raise Palaces, and Manors buy,
Collect a Tax, or farm a Lottery,
With warbling Eunuchs fill a licens’d Stage,
And lull to Servitude a thoughtless Age.