A law stating/clarifying that only individuals, not companies, have first amendment rights would sort much of it out, coupled with caps on political donations p

A law stating/clarifying that only individuals, not companies, have first amendment rights would sort much of it out, coupled with caps on political donations per individual, including donations in kind (like sympathetic campaigns.) (I'm from UK, by the way, so I'm no expert on the US constitution, but we have similar issues here. Just trying to be logical - which always works in politics...)