Should I advise you? This kind of discussion should be written in your local thread for effective discussion.
Agreed. I have no idea what OP is talking about exactly, and as is typical for members here, very little details are supplied as to what's supposed to be the topic. I initially thought this might be about the US government and all of their excess spending on idiotic shit, but apparently not. That's fine, too since government waste has been a contentious subject likely since the beginning of society and governments.
But if I may ask, how can citizens effectively engage the government in that they can curb some of these corruption cases in the financial sector across the world.
I believe the answer to the question you asked is always in front of you. The citizens have always shown their dissatisfaction through various means like activism, protests, suing of government, and reporting them to international bodies and allies among others.
However, the right question is, are these working? The answer may be a capital No in most countries. Naturally, if a country has good leaders, there will be no need for the citizens to go that length but to engage the government with constructive and creative ideas that can move the country forward for the common good of all. This means that it will be for the benefit of both the government and the citizens even if the government is bereaved of ideas.
Sadly, irresponsible and corrupt governments will continue to find excuses and get more advanced in how to steal public funds, even as they turn a deaf ear to the cry of the people.