Photograph: Kirsty O'Connor/PA
Undercover police have spied on more than 1,000 political groups in the UK since 1968, but with no officially published list of the groups the Guardian is now compiling a searchable database.
It is currently a work in progress which will be updated as more information becomes public, and as part of our investigation we are now asking for your help.
Share your stories, experiences and news tips
If you have information you would like to share with our reporters about this undercover policing or have been affected by this story, we would like to hear from you. Your input will help us build a more complete picture of the facts, and with your permission we may contact you to discuss further.
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