Ah, so a right hook basically. They probably need to raise the crosswalks at that intersection and make it clearer where the bike lane is.

Probably worth a 311 report: https://www.cambridgema.gov/commonwealthconnect

plus a follow-up email to Cambridge's City Councilors: https://www.cambridgema.gov/Departments/citycouncil/members

and maybe CC Cambridge Bike Safety or try them first: https://www.cambridgebikesafety.org/join/

City Councilors Burhan Azeem and Patricia Nolan are pretty pro cycling; I've met both at events around the City and they would probably take this more seriously than some other City Councilors would. Cambridge Bike Safety is really well organized and the folks there would probably help guide you to the right people to fix that intersection.