> Can't they can give money to PACs which then give to candidates?
No, but they can sponsor a PAC, which frees up more of the money a PAC raises from individual sources for donations to candidates; this is different only if you ignore the fungibility of money.
(They can also spend directly or via a “SuperPAC” on advocacy that is for/against candidates but legally not coordinated with candidates, and SuperPAC activity in practice is often coordinated with campaigns via public signalling and other mechanisms.)
No, but they can sponsor a PAC, which frees up more of the money a PAC raises from individual sources for donations to candidates; this is different only if you ignore the fungibility of money.
(They can also spend directly or via a “SuperPAC” on advocacy that is for/against candidates but legally not coordinated with candidates, and SuperPAC activity in practice is often coordinated with campaigns via public signalling and other mechanisms.)