The tuskegee syphilis study, an example of serious ethical transgressions, violated which ethical principle?

I believe the answers are:
-  Freedom from harm (Because the researchers told the subjects that they're gonna be treated for the illness, but actually given placebo)
- Right to self-determination (The researchers initially lie to the subjects about what type of experiment they're conducting)
- Right to fair treatment (some subjects were given the drugs in the next 6 months while the others were left in the dark for 40 years)