A Birmingham University lecturer and outspoken critic of Israeli policies in the Middle East says she has been the victim of death threats.
Police are investigating a series of menacing phone calls made to English language lecturer Sue Blackwell.
Ms Blackwell, who has attacked the Israeli government over treatment of people in the occupied territories, said she has also been threatened by email and in a letter.
She was recently behind a successful motion to get her union - the Association of University Teachers - to boycott two Israeli universities.
The union has accused the institutions of human rights' abuses - a charge which they both deny. One of them - Haifa - has issued a defamation writ against the AUT.
Ms Blackwell said: "I can't allow these people to intimidate me."
Ms Blackwell said she was most concerned about sinister phone calls from one man, which have been referred to the police.
"This particular gentleman starts by saying 'I can't vouch for your safety'. He is making threats to my physical safety.
"I have also had two death threats from Israel. It is not pleasant and it is a distraction from my academic work," she said.
The AUT has accused Haifa University of disregarding academic freedom by threatening to sack and put on trial a senior lecturer who backed a student thesis alleging Israeli army abuses.
The other university being boycotted by British universities is Bar-Ilan, which the AUT accuses of supervising degrees at a college established in an illegal settlement in the occupied West Bank.