The twitter accounts are presumably run by people who are employed by agencies funded by the US government. They could lose their jobs or have funding problems because of this.

I think a more fair comparison would be to when scientists were gagged in Canada, under the Prime Minister Harper era.

One of many sad examples: http://www.cbc.ca/news/politics/harperman-tony-turner-scient... https://www.youtube.com/watch?v=Ei50lM6ab1c

Of course, it's not muzzling, it's "ethics violations".