Hi @Fernanda Gonzalez - unfortunately the Activity Log natively doesn't show when labels are added / removed from a card and who did this action, but I've raised a feature request for our team to look into adding this capability: https://jira.atlassian.com/browse/TRELLO-452
I recommend voting / watching that feature request, and sharing your feedback in its comments. I've also added a workaround you can use to that feature request.
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