Man randomly detained and accused of a crime without proof or connections to the actions

The victim and a friend were detained as they were leaving his house by the political police and three agents of the Public Order. They were handcuffed without given explanation and then taken to a police station where they were beaten. The victim and his friend were then taken to the cells and released hours after to be interrogated where the victim was harassed and insulted. They were accused of putting up posters that they had nothing to do with and advised to stop their activities.