Linda Sarsour, one of the most prominent Muslim-American activists in New York, says the messages have been arriving by the hour recently.

“Your time is coming.”

“A good Arab is a dead Arab.”

“You’re getting two bullets in your head.”

Ms. Sarsour, one of the lead organizers of the Women’s March on Washington, has tackled issues like immigration policy, mass incarceration, stop-and-frisk and the New York Police Department’s spying operation on Muslims — all of which have largely inured her to hate-tinged criticism.

But it is the commencement address she is to deliver next week to about 100 students at the City University of New York School of Public Health that she says has drawn the most hostility and ire she has ever experienced.

“Linda Sarsour is a Sharia-loving, terrorist-embracing, Jew-hating, ticking time bomb of progressive horror,” the conservative media personality Milo Yiannopoulos said at a rally on Thursday outside CUNY’s main office, as protesters held signs with images associated with the often racist and anti-Semitic language used by what is known as the alt-right, a far-right, white nationalist movement.