Unless you are in the United States and your money is going to a super PAC, union, or other association. Then your transmission of funds is free speech and covered by the first amendment. [1]
> your transmission of funds is free speech and covered by the first amendment
Political spending has been equated with political speech by the Supreme Court. That doesn't mean the government can't e.g. freeze a criminal's assets.
Super PACs have to report how they spend their money and where they got it from. As long as they don't communicate with a campaign, how they spend it is free speech. This is very different from not reporting where you spend your money or where you got it from.
[1] https://en.wikipedia.org/wiki/Citizens_United_v._FEC