Pollak simply rode his bicycle as part of a Critical Mass demonstration, along with dozens of other Israelis. Police admi tted they singled him out because they recognised him and thought he was the organiser of the demonstration (he wasn't). He did nothing except ride his bike and for that he is now spending 3 months in prison.
Colombia recalls ambassador to Venezuela amid border crisis (Reuters)
from the article: Israeli leftist jailed three months for protesting Gaza blockade