POTUS Gerald Ford said this in 1974 to a joint session of Congress: "A government big enough to give you everything you want is a government big enough to take from you everything you have." He understood that there are two sides to the power of big government. Lobbyists and special interest groups know how to work both sides, this is true in the USA, Canada, and everywhere there is big government. Of course even in free and democratic countries there is corruption in government despite the best efforts of the law makers and the judiciary, corruption seems to be a "function" of government AND a function (in the mathematical sense) of BIG government. (yes two meanings of 'function').
Dan Mitchell at CATO produced a short video that suggests how to avoid corruption. Even though its content and advise is directed to an American audience, there is much to learn from it: