Nikon

In 2012 the Enough Project published the Conflict Minerals Company Rankings, which ranked the world's largest electronics companies on their efforts toward using and investing in conflict-free minerals in their products. This company received a 'Red' ranking, signifying it has "done next to nothing to shift their practices toward conflict-free from Congo. They are not members of industry-wide efforts, have not taken the proper steps to investigate their supply chains, have said nothing about legislation, and are not actively engaged with other stakeholders."
[Source 2012][More on Human Rights]

UK animal rights campaigners Viva! are calling for a boycott of Nikon for facilitating and promoting the shooting of wild animals with both cameras and guns. Nikon sponsor trophy hunting in the United States and also produce a riflescope specifically designed for killing large wild animals in Africa.
[Source 2014][More on Animal Rights]

Milieudefensie and Friends of the Earth have assessed how open manufacturers of smartphones, tablets, laptops and game consoles are about the use of materials, water, land surface area and greenhouse gas emissions. Assessment also covered whether manufacturers are honest about the use of tin from Indonesia and whether they are prepared to address the abuses in the tin mines on Bangka in Indonesia, such as by participating in the IDH project (Sustainable Trade Initiative). This company received an 'orange' rating, indicating they either take no responsibility for the situation on Bangka Belitung or do not provide enough information on the use of raw materials.
[Source 2015][More on Human Rights]

This website by German NGO Earth Link rates companies on their corporate policies against child labour, production monitoring and accusations of child labour. This company received at least one red mark, indicating poor performance in one or more of these areas.
[Source 2013][More on Human Rights]