This Week in Hate tracks hate crimes and harassment around the country since the election of Donald Trump. The Southern Poverty Law Center and other groups are keeping detailed counts of harassment and abuse. We will regularly present a selection of incidents to show the scope of the problem. This article, the first in the series, includes incidents reported in the last two weeks.

• In the last week, three mosques in California and one in Georgia have received letters threatening that Donald Trump “is going to do to you Muslims what Hitler did to the Jews.” The letters were signed “Americans for a Better Way.”

• Last week, a passenger on a Delta flight began shouting, “Donald Trump” and asked, “We got some Hillary bitches on here?”

• In Astoria, Queens, on Nov. 17, an Arab-American Uber driver recorded a video of another driver shouting at him that “Trump is president” and “they’ll deport you soon.”