I read this sentence on BBC News,

He was among those beaten by police during the infamous Selma-Montgomery voting rights march of 1965.

link: https://www.bbc.co.uk/news/world-us-canada-38636136 (waybackmachine)

As dictionaries I read suggested, Infamous is used for

having an extremely bad reputation

or

deserving of or causing an evil reputation

It seems to me, the word infamous only can be used to describe a event caused by the bad people, so in this BBC News article, it is the attack on the march being bad (infamous) and the march itself organised by civil rights activists to express a good will is not.

I just lost here, can someone explain it to me why they use infamous here?