once you move them to a category you can do this in common css, just insert the category slug name in the code.
body.category-YOUR-CATEGORY {
.widget-button.btn-flat.toggle-like.like.no-text.btn-icon,
.widget-button.btn-flat.toggle-like.has-like.fade-out.no-text.btn-icon,
.widget-button.btn-flat.button-count.like-count.highlight-action.regular-likes.btn-text,
.widget-button.btn-flat.button-count.like-count.highlight-action.my-likes.btn-icon-text {
display: none;
}
}
if it happens to be a subcategory, you will need to use the path parent-category-slug-subcategory-slug.
edit: updated the code because the first i posted would hide flag counts.