Sometimes, like in the example below, clues can come from verbage, (like is heard everyday and night on any MSNBC & CNN panel discussion) and maybe timing of the hoax. (the leftist pivot to 'White Supremacy ') This one looks very suspicious to me. You tell me. (bold emphasis below is mine)
The Hill - Police in Charlotte, N.C., are investigating after a threatening letter was sent to numerous lawmakers of color in the city, including Charlotte Mayor Vi Lyles (D) . City officials told The Hill that African American members of Charlotte's city council received a letter filled with racist remarks, advocating that the lawmakers, all of whom are Democrats, be "tarred and feathered and run out of town."
The letters, which made numerous references to the lawmakers' ethnicities, were also sent to Councilwoman Dimple Ajmera (D), who is of Indian descent, according to a city spokesperson.
Among the topics in the letter, the author expressed praise for President Trump's recent tweets aimed at four minority congresswomen that urged them to "go back" to other countries."I do believe you need to go back to where you came from if you don't BEGIN to show this great country some RESPECT and HONOR," the letter read. "We'll round you up and send you screaming to the concentration camps where you belong," it continued.It wouldn't surprise me at all if this turns out to be the act of a failed journalist, or out of work Black Studies major. Hoax or not, there's no need at all for this kinda crap!
It also worth noting that Charlotte N.C. will be the site of the 2020 Republican National Convention. Could it be that it's never to early to start stirring up the natives......
You can read a lot more Here in The Charlotte Observer.