Bird, I posted the actions and words of Common Cause and two or three election law experts about "things of value" that are diametrically opposed to what Junebug says is the law.
Here are some more that agree with this position:
https://www.vox.com/world/2017/7/10/15950590/donald-trump-jr-new-york-times-illegal
"But experts on national security and election law say this “defense” is, legally speaking, no defense at all.
“The emails are simply put damning as a legal matter,” explains Ryan Goodman, a former Defense Department special counsel and current editor of the legal site Just Security. “The text of the emails provide very clear evidence of participation in a scheme to involve the Russian government in federal election interference, in a form that is prohibited by federal criminal law.”
Jens David Ohlin, a law professor at Cornell University, is even blunter: “It’s a shocking admission of a criminal conspiracy.”
Trump Jr.‘s decision to take the meeting in and of itself likely violated campaign finance law, which does not require you to actually get anything useful from foreigners. In other words, the mere fact that Trump Jr. asked for information from a Russian national about Clinton might have constituted a federal crime."
https://www.law.cornell.edu/cfr/text/11/110.20
"(b)Contributions and donations by foreign nationals in connection with elections. A foreign national shall not, directly or indirectly, make a contribution or a donation of money or other thing of value, or expressly or impliedly promise to make a contribution or a donation, in connection with any Federal, State, or local election."
"(g)Solicitation, acceptance, or receipt of contributions and donations from foreign nationals. No person shall knowingly solicit, accept, or receive from a foreign national any contribution or donation prohibited by paragraphs (b) through (d) of this section."