An independent US Senate candidate is convinced he is a victim of sinister political forces in Cambridge City Hall who are demanding he remove an anti-Elizabeth Warren sign that hangs from his campaign bus on Concord Avenue.

Shiva Ayyadurai, who began running in the Republican primary but shifted to an independent candidacy late last year, claims in a federal lawsuit, which he says he filed this week, that city officials are violating his First Amendment rights and carrying out political retaliation against him because he is attacking Warren over her claims to Native American heritage.

Read the full article at The Boston Globe website.